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Testing, Ford (Bosch Type); "...Fuel pump relay switches, and other relays are similar to the starter solinoid, in that they make a high amperage connection through a switched low amperage connection. There are two smaller connections, and two larger connections. TO test it, apply 12v to one of the smaller connections, and ground the other smaller connection. (I used to small aligator clipped jumper wries separated by a small piece of cardboard to keep them from shorting against each other.) You should hear it click. Then check for continuity between the two larger connections.Now remove the power from the smaller connections and recheck continuity between the larger connections.With power, one should have continuity, without power it should be an open circuit (no continuity)..."
Source: by Poppy at fordforumsonline.com
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4WABS Relay Location in Power Distribution Box Diagram in a 96 Bronco & F-Series
Source: by Ford via thedieselstop.com
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4WABS Trailer Relay Location in Power Distribution Box Diagram in a 94 Bronco & F-Series
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Trailer Relay Location in Power Distribution Box Diagram in a 95
Source: by Seabronc (Rosie, Fred W) at Ford Bronco Zone Forums
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4WABS Trailer Relay Location in Power Distribution Box Diagram in a 96 Bronco & F-Series
Source: by Ford via thedieselstop.com
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Accessory pic, Mounted in Glove Box in a 79
Source: by Zoso (Rob B) at SuperMotors.net
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Bosch Overview, Schematics, etc.
Source: by Craig U at classictruckshop.com
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Charge Indicator Lamp Relay Location in Engine Bay Diagram in a 90
Source: by Seattle FSB (SeattleFSB) at SuperMotors.net
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Connector Location Diagram, Engine Area in a 92 5.0 & 5.8
Source: by Ford via Jem270 at Supermotors.net
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DTC 542 "...No Start: Inertia Fuel Shutoff (IFS) switch not reset or electrically open. Open circuit between the fuel pump and FPM circuit connection to the power-to-pump circuit. Poor fuel pump ground. Fuel pump electrically open. Engine Starts: Fuel pump secondary circuit short to power. Fuel pump relay contacts always closed. Open in FPM circuit between PCM and connection to the power-to-pump circuit. Left/front HO2S short to power (dual HO2S applications) Damaged Powertrain Control Module (PCM). Does the engine start? (For trucks with dual fuel tanks, verify tank selector is in the same position it was when KOEO DTC 542 was received.) Yes GO to J11. No GO to J15..."
Source: by SigEpBlue (Steve) at FSB
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DTC 556 (O,M) Fuel pump relay primary circuit fault in a 90 4.9 F 150; "...You will need to trouble shoot the circuit to see if it is a EEC or FP relay, the inertia switch or corroded wiring, relay sockets, etc. The fuel pressure should be in the 45-60 psi range.Fuel Pressure Regulator (FPR) Delay TSB 93-22-14 for 90-93 4.9L (Cold Start & Idle Stall)..." READ MORE
Source: by miesk5 at Ford Bronco Zone Forums
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DTC 87 - FP relay circuit failure- suspect inertia switch, fusible link, FP relay
Source: by miesk5 at Ford Bronco Zone Forums
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DTC 87, 95 & 96; "...These codes relate to low or no power reaching the fuel pump. Start testing at the fuel pump relay. The relay must respond to the EEC processor and the relay contacts must be a low resistance path for fuel pump power. Relay testing can be done in a couple minutes with the fuel pump test table. Fuel pump relay testing;1. Use solenoid test at EEC pin 22 to check relay coil current draw. 2. Voltage at pump power terminal must be within .5v of battery power when relay is turned on with amp meter at pin 22. Check power from battery if voltage is low. Check the inertia switch and fuse if battery voltage is missing. Pin 22- (light blue-orange) Grounded to turn "on". Voltage will drop to about 1v when "on". Current draw will be 160 to 270mA Pin 8- fuel pump monitor (dark green-yellow) 0v engine off, battery voltage with engine running..."
Source: by Dustin S (Dustball, Mellow Yellow, Mr. Laser Boy) at FSB
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DTC 96 Fuel Pump circuit failure, battery to processor; "check batty cables, connectors, grounds for corrosion; check voltage @ pump, etc..."
Source: by miesk5 at Ford Bronco Zone Forums
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EEC & Fuel Pump Relay Color Codes for Troubleshooting/Swapping to Bosch Style Relays
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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EEC & Fuel Pump Relay Swapping to Bosch Style Relays & Color Codes in all pre-'92 EFI Bronco & F-series; "...Working on ONE relay at a time, remove the terminals from the stock connector & discard it. I collected these Bosch-style sockets in junkyards, but they're available at most parts stores, from Ford, or several online suppliers like RJMInjectionTech.com as crimp-on kits for a near-factory look. Being careful to connect the wires to the proper terminals (using the list below), securely connect the old wires to the terminals of the new sockets. Try to keep the wires the same length so there's not a huge ratnest. EEC PWR 30 - Y (battery always 12V) 87 - Bu, DB, R (out to EEC) 85 - Wh/LB, R/LG (12V in from ig.sw.) 86 - Bk/LG, Bk (ground); FP: 30 - Y (battery always 12V) 87 - Pk/Bk, Br, DG/Y (out to inertia sw.) 85 - R (12V in from EEC PWR relay) 86 - T/LG, LB/Or (ground from EEC)...It's OK to reverse 30 with 87, or 85 with 86 on either relay. It's possible to just use common insulated flat blade terminals to connect the bare wires to the relay terminals without a socket, but it's not as secure or convenient. Now the truck will be MUCH more reliable, and can use the cheaper, heavier-duty, more common ISO relays that are easier to swap. Tape up the harness & secure the relays to a safe mounting location. Not all relays have mounting tabs like these, but the sockets or harness can be zip-tied to something solid..."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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EEC (PCM) Relay Wiring Diagram in a 95 (see #2)
Source: by Seabronc (Rosie, Fred W) at Ford Bronco Zone Forums
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EEC IV Wiring Diagram in a 90 F 150 w/Dual Tanks & Pumps
Source: by Ford via subford (Bill K) at photobucket
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EEC Relay (BROWN Connector, next GREEN FP Relay Connector Under hood behind air cleaner assy) Location pic in a 90 and all up to 91
Source: by Need4racin (The 90 Bronco, Dean) at FSB
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EEC Relay Connector Location Diagram, Engine Area in a 91 4.9
Source: by Ford via chiltonlibrary.com
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EEC Relay Location Depiction in 84-86
Source: by Ryan M (Fireguy50) at FSB
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EEC Relay Location Depiction in 84-86
Source: by Ryan M (Fireguy50) at fordfuelinjection.com
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EEC Relay Location in an 85 302 (mounted behind the airbox)
Source: by Chris B (Blue, bronco boy) at telus.net
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EEC Relay Location in an 85; "...eec relay is behind the dash, roughly above the gas pedal and to the right a little behind the blower switch about 3 inches..."
Source: by Wolfgangpeanut at FSB
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EEC Relay Location in an 85; "...It is just behind the engine computer, above the gas pedal. Look in back of the rear defroster switch about 3 inches. When you find it check all you wiring to connector..."
Source: byJimDez at FSB
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EEC Relay Location in an 86; "...On some 86's (like mine) you will find the EEC Relay in the cab to thr right of the gas pedal...sorta where your ash tray would be..."
Source: by Xris at FSB
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EEC Relay Location in Power Distribution Box Diagram in a 95
Source: by Seabronc (Rosie, Fred W) at Ford Bronco Zone Forums
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EEC Relay Location in Power Distribution Box Diagram in a 96 Bronco & F-Series
Source: by Ford via thedieselstop.com
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EEC Relay Overview, Depiction & Wiring Diagram in a 94
Source: by Ford via thedieselstop.com
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EEC Relay Pin-Outs (Partial) in 88-89 & 90-91 Bronco 4.9; 88-90, 91 & 92-93 Bronco 5.0; 88-91 & 92-93 Bronco 5.8; Looking Into Harness Connectors in Ford Electronic Engine Control Overview, Chapter 12, of Ford Fuel Injection and Electronic Engine Control: How to Understand, Service and Modify, 1988-1993
Source: by Charles O. Probst via yunost.ru
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EEC Relay Wiring Diagram in 92-95 Bronco & F Series
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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EEC Relay Wiring Diagram in a 90
Source: by Seattle FSB (SeattleFSB) at SuperMotors.net
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EEC Relay Wiring Diagram in an 84
Source: by toddcomputer.com
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EEC Relay Wiring Diagram in an 86
Source: by Xris at SuperMotors.net
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EEC Relay Wiring Diagram in an 89
Source: by SeattleFSB (Seattle FSB) at SuperMotors.net
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EEC Relay; An inertia switch is used as a safety device in the fuel system. The inertia switch is located in the cab, generally under the dashboard on the right side. It is designed to open the fuel pump power circuit in the event of a collision. The switch is reset by pushing each of 2 buttons on the switch simultaneously (some models use switches with only one reset button). The inertia switch should not be reset until the fuel system has been inspected for damage or leaks. When the ignition switch is ON, it turns the EEC power relay ON. The EEC power relay provides power to the powertrain control module (PCM) and the control side of the fuel pump relay. Power for the fuel pump(s) is supplied through a fuse link or high current fuse attached to the starter solenoid (battery side). From the fuse link or high current fuse, current flows through the fuel pump relay and inertia switch to the fuel pump(s). The fuel pump relay is controlled by the PCM. When the ignition switch is turned ON, the fuel pump(s) will operate. If the ignition switch is not turned to the START position the PCM will shut the fuel pump(s) OFF after 1 second. The PCM will operate the fuel pump(s) operate the fuel pump(s) when the ignition switch is turn to START position to provide fuel while cranking. After the engine starts, the PCM will continue to operate the fuel pump(s) unless the engine stops, drops below 120 rpm or the inertia switch is tripped..." (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via AutoZone
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EEC Relay; Scan Tool Won’t Initiate Self-Tests; Vehicle Battery goes Dead, Short Solenoid Body Life, 4th Gear Starts in D/High Pressure may be caused by a malfunctioning Electronic Engine Control (EEC) Relay. The EEC relay is controlled by 12 volts from the ignition switch and is responsible for supplying voltage to the computer and solenoid body. If the relay contacts stick open, the complaints are as follows: Gas engine applications won’t start, Diesel will start and run, but have 4th gear starts in D, 2nd gear in 2 and 1, and maximum line pressure. If the contacts are stuck closed, the complaints may be as follows: Both gas and diesel engine application: Scan tool won’t work, vehicle battery goes dead, short solenoid body life. Note: Watch for corroded relay terminals and connectors on 89-91 E-series vans. The relay is very close to the right side battery and prone to corrosion problems especially on diesel ambulances..." read more, Diagrams are gone
Source: by ATC-Distribution Group Inc. atcdg.com via web.archive.org
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EEC Wiring Diagram in an 81 F 150
Source: by Chilton via miesk5 at FSB
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EEC Wiring Diagram in an 86 & Ford truck
Source: by Agnem (The Moosestang) at webshots.com
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EEC, Fuel Pump, etc. Relay Location in a 90; on driver's side fender apron
Source: by Seattle FSB (SeattleFSB) at SuperMotors.net
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EEC-IV Relay Wiring Diagram in a 94 from EVTM
Source: by Mikey350 at SuperMotors.net
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Electric Fan Relay Installation & Part Numbers in a 79
Source: by axaviere (Truck) at FSB
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Electric Fan Relay Installation pics in a 79
Source: by axaviere (Truck) at SuperMotors.net
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Electric Fan Relay Installation, Diagram & Part Numbers in an 83 351W
Source: by Seabronc (Rosie, Fred W) at SuperMotors.net
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Electrical Symbols in an 86 from Electrical and Vacuum Troubleshooting Manual (EVTM) Partial
Source: by Ford via Chris B (Blue, bronco boy) at telus.net
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Engine Compartment Relay Mounting Bracket Fabrication
Source: by Seattle FSB (SeattleFSB) at FSB
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Engine Compartment Relay Mounting Bracket Fabrication pics
Source: by SeattleFSB (Seattle FSB) at SuperMotors.net
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Fuel Pump & EEC (PCM) Relay Wiring Diagram in a 95 (see #3)
Source: by Seabronc (Rosie, Fred W) at Ford Bronco Zone Forums
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Fuel Pump Relay & EEC Relay Color Codes; for troubleshooting/swapping to Bosch Style relays
Source: by Steve83 (Steve, That dirty old truck) at FSB
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Fuel Pump Relay (GREEN Connector, next Brown Connector Under hood behind air cleaner assy) Location pic in a 90 and all up to 91
Source: by Need4racin (The 90 Bronco, Dean) at FSB
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Fuel Pump Relay Connector Location in Engine Bay Diagram in a 90 5.0 & 5.8 Page 2
Source: by Seattle FSB (SeattleFSB) at SuperMotors.net
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Fuel Pump Relay Location Depiction in a 91 (engine compartment)
Source: by Vincent C at autorepair.about.com
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Fuel Pump Relay Location in an 85 302 (mounted behind the airbox)
Source: by Chris B (Blue, bronco boy) at telus.net
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Fuel Pump Relay Location in an 85; "... is on the driver side firewall near the fender to the right of the vaccume booster for the brakes..."
Source: by Wolfgangpeanut at FSB
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Fuel Pump Relay Location in Power Distribution Box (PDB) in a 93 Bronco
Source: by Troll Banned (Bronco Rob, BroncoRob) at SuperMotors.net
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Fuel Pump Relay Location in Power Distribution Box Diagram in a 96 Bronco & F-Series
Source: by Ford via thedieselstop.com
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Fuel Pump Relay Overview, Depiction & Wiring Diagram in a 94
Source: by Ford via thedieselstop.com
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Fuel Pump Relay Socket Corrosion Info; "...if you had corrosion in your relay socket, then you probably have it other places. one at a time unplug all relays and connectors on that fender and spray them down with contact cleaner. then after you let that do it's job for about 30min-1hr, go back and unplug each relay and connector again (one at a time) this time put them together with di-electric grease. you can buy a tube of it from any electrical/electronics supply or auto store. make sure you get everything plugged back in..."
Source: by datrimm (HiTechRedNeck) at FSB
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Fuel Pump Relay Swap to Bosch Type in all pre-'92 EFI Bronco & F-series
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Fuel Pump Relay Swap Wiring to Bosch Type in all pre-'92 EFI Bronco & F-series
Source: by Steve83 (Steve, That dirty old truck) at FSB
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Fuel Pump Relay Swap with Horn Relay in 92-96 to Test FP Relay
Source: by Steve83 (Steve, That dirty old truck) at FSB
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Fuel Pump Relay to PCM in PCM Connector Pin-Out Diagram with Circuit Functions in a 96 5.0 and 5.8 (Scroll Down) from 1996 F-150, 250, 350 (4x4), and Bronco Vehicles Workshop Manual
Source: by Ford via thedieselstop.com
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Fuel Pump Relay Wiring Diagram in 92-95 Bronco & F Series
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Fuel Pump Relay Wiring Diagram in 92-95 Bronco & F Series
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Fuel Pump Relay Wiring Diagram in a 90
Source: by Seattle FSB (SeattleFSB) at SuperMotors.net
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Fuel Pump Relay Wiring Diagram in a 94 from EVTM
Source: by Mikey350 at SuperMotors.net
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Fuel Pump Relay Wiring Diagram in an 84
Source: by toddcomputer.com
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Fuel Pump Relay Wiring Diagram in an 86
Source: by Xris at SuperMotors.net
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Fuel Pump Relay Wiring Diagram in an 86 & Ford truck
Source: by Agnem (The Moosestang) at webshots.com
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Fuel Pump Relay Wiring Diagram in an 86 5.0
Source: by Ryan M (FireGuy50) at fordfuelinjection.com
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Fuel Pump Relay Wiring Diagram in an 89
Source: by SeattleFSB (Seattle FSB) at SuperMotors.net
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Fuel Pump Relay; "...An inertia switch is used as a safety device in the fuel system. The inertia switch is located in the cab, generally under the dashboard on the right side. It is designed to open the fuel pump power circuit in the event of a collision. The switch is reset by pushing each of 2 buttons on the switch simultaneously (some models use switches with only one reset button). The inertia switch should not be reset until the fuel system has been inspected for damage or leaks. When the ignition switch is ON, it turns the EEC power relay ON. The EEC power relay provides power to the powertrain control module (PCM) and the control side of the fuel pump relay. Power for the fuel pump(s) is supplied through a fuse link or high current fuse attached to the starter solenoid (battery side). From the fuse link or high current fuse, current flows through the fuel pump relay and inertia switch to the fuel pump(s). The fuel pump relay is controlled by the PCM. When the ignition switch is turned ON, the fuel pump(s) will operate. If the ignition switch is not turned to the START position the PCM will shut the fuel pump(s) OFF after 1 second. The PCM will operate the fuel pump(s) operate the fuel pump(s) when the ignition switch is turn to START position to provide fuel while cranking. After the engine starts, the PCM will continue to operate the fuel pump(s) unless the engine stops, drops below 120 rpm or the inertia switch is tripped..." (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via AutoZone
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Fuel Pump Runs w/Ignition Switch Off; "...If it stays running with the truck off, then most likely you have a bad fuel pump relay; EEC Relay hanging closed; If the EEC relay goes bad, it could be sending the signal to the fuel pump relay to turn the fuel pumps on; One easy test for this is: Without the key in ignition, bump the starter over @ the starter relay using a screwdriver. If it is the EEC relay, the truck will start without the key in the ignition..." MIESK5 NOTE; from Ford EVTM; The Control Module (PCM) runs the pump{s} for one second when it receives an ignition- on signal. It also runs the pumps as long as it receives a PIP signal from the Hall-effect devices, it continues pump operation even after the key is released from START. If the PIP signals fall below 120RPM, the control module cuts off the signal to the fuel pump relay or the integrated relay control module. The pump will also run when the terminals of the fuel pump test connector are jumped. the Control module signals the pump when it receives a CRANK signal, and when the Control module gets PIP signals that the engine is running. the pump does not run if the PIP indicates the engine is not running even with ignition ON {except for that first one second}.
Source: by sackman9975 (Scott), Redwagon & miesk5 at FSB
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Fuel Pump Runs w/Ignition Switch Off; "...The relay probably has the points welded. Here is a diagram of the circuit..."
Source: by Seabronc (Rosie, Fred W) at Ford Bronco Zone Forums
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Fuel Pump Wiring Diagram in a 90 F 150 w/Dual Tanks & Pumps
Source: by Ford via subford (Bill K) at photobucket
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Fusible Link: A-Brown 18ga to Rear Window Defroster; W-Blue 20g to Fuel Pump Relay; N-Blue 20g to EEC Power Relay; F-Blue 20ga to Trailer; Y-Blue 20ga to N.C.; L-Brown 18ga to ?; M-Brown 18ga to ?;G-Blue 20g to Exterior Lamps, Trailer; P-Blue 20ga to ?; & J-Green 14ga to Alternator as shown in Wiring Diagram in an 89
Source: by Seabronc (Rosie, Fred W) at Ford Bronco Zone Forums
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Hella Lights pic in a 93 5.0; MIESK 5 Note, site won't allow you to return to this page
Source: by Streetgang (Steven F) at fototime.com
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Horn Relay Connector Location Behind Dash in a 90
Source: by Seattle FSB (SeattleFSB) at SuperMotors.net
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Horn Relay Location in 80-86 & a 90; "...relay is mounted on the cruise control amp which on 80 - 86 is just under the dash to the right of the driver position. It has a metal cover with 3 contacts. On a 90, If you have cruise control, you have a horn relay which is located under the dash..."
Source: by Seabronc (Rosie, Fred W) at Ford Bronco Zone Forums
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Horn Relay Location in a 92-96; "... Horn Relay is in da Power Distribution Box (PDB); here is the PDB Diagram in a 96, sim to a 95; the PDB is Located under the hood on the drivers side fenderwell, behind the stock air cleaner location. See Relay #3; you can swap it temp w/da FP relay to verify where it is good, check for corrosion..."
Source: by miesk5 at FSB
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Horn Relay Location in an 89; "...under the middle of the dash, but it's probably not the older metal 3-terminal relay attached to the cruise module; it looks more like the FP relay. If that's what you have, I suggest you chop it (& the FP & EEC PWR relays) off and replace it with a Bosch/ISO..."
Source: by Steve83 (Steve, That dirty old truck) at Ford Bronco Zone Forums
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Horn Relay Location in an 89; it looks like non-cruise 89's do Not have a Horn Relay; Look at these Haynes Wiring Diagrams for 87-89 Bronco & F series by equivalent (Beetlejuice) at SuperMotors.net; It shows; to Relay with Cruise - and to Horn Switch without Cruise;YEL-LT BLU & BK BLU @ Switch
Source: by miesk5 at FSB
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Horn Relay Location in Power Distribution Box Diagram in a 96 Bronco & F-Series
Source: by Ford via thedieselstop.com
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Horn Relay Location pic in an 88; '...For an 89 with cruise it will be almost directly behind the cubby to the right of the steering column. If you didn't have cruse you don't have a horn relay. Here's a picture of it unbolted and swung down around..."
Source: by Adrianspeeder (The OJ Special, The Lariat, The Bronco) at FSB
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Horn Relay Location pic in an 88; For an 89 with cruse it will be almost directly behind the cubby to the right of the steering column. If you didn't have cruse you don't have a horn relay. Here's a picture of it unbolted and swung down around.,,"
Source: by Adrianspeeder (The OJ Special, The Lariat, The Bronco) at SuperMotors.net
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Horn Relay Wiring Diagram in 78 Bronco & 76-78 F Series
Source: by Blue79 at photobucket.com
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Horn Relay Wiring Diagram in an 84; W/Cruise Control only
Source: by toddcomputer.com
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Kill Switch Wiring Diagrams; "...will allow the engine to continue running, but won't allow it to be started. This will preserve the clock & radio memories, and confuse most thieves since every other electrical device will work normally. It will appear that the starter is defective..."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Light control, Wipers-on-lights-on, Fog Lamp, Headlights powered from battery control pics in an 83
Source: by Fred W (Rosie, Seabronc) at SuperMotors.net
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Lighting pic for driving, cornering & fog lights in a 90
Source: by GHOSTRIDER (Pete H) at SuperMotors.net
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Location Diagram in Power Distribution Box (PDB) in a 92 Bronco & F-Series
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Location Diagram in Power Distribution Box (PDB) in a 93
Source: by Troll Banned (Bronco Rob, BroncoRob) at SuperMotors.net
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Location Diagram in Power Distribution Box (PDB) in a 94 Bronco & F-Series
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Multi-Function Switch (MFS) Failure Causes; "...Mechanical components wear out or electrical connections are faulty; If the switch assembly is not operating properly, turn signals, hazard warning lamps, windshield wipers/washers and the headlamp beam selection may not operate properly. Related Components to Check; The switch itself, the electrical connections to the switch and the connections to each of the affected components (items such as turn signals, wipers, etc.)..." miesk5 Note; enter applicable info for year, etc.
Source: by MOTORCRAFT®
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No Start Troubleshooting, EFI; for a Mustang but many tips are applicable
Source: by jrichker via Seijirou at FSB
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No Start Troubleshooting; "...First thing to check is wiring. Between the large posts of your starter relay (it's not a solenoid) should be a smaller post with a wire attached. This is the wire from your ignition switch through the Park/Neutral Safety Switch (NSS)/Manual Lever Position Sensor (MLPS), Or clutch safety switch on a manual trans, or NSS/MLPS with an AOD/E4OD, to the starter relay and the on to the starter solenoid (if equipped) and starter. Check this wire for cracks, open insulation, or anything that could possibly cause an open circuit. Next, check your upper ignition actuator. Find the ignition rod (on top of the column, running from the steering wheel down to the ignition switch at the base of the column) and make sure it's moving back and forth when you turn the key, through all positions. If it is, your upper actuator is probably not the problem. Lastly, check your ignition switch (again, at the base of the column). Manually push the switch back and forth through the different positions. Push it all the way forward (or down) and see if it will engage the starter. If it does, then your ignition rod is probably bent, which can be remedied quite easily. & If it's an auto, try starting in neutral or while pulling up on the lever while it's in park. If that works, look to the Park/NSS/MLPS. If it's a stick, check the clutch switch. You could try jumping from hot to the small terminal on the starter relay to test it's operation. Sometimes new ones are bad out of the box. If it won't turn over when jumped to the small terminal, you'll know that it's a starter relay issue (Bad part, bad ground or a bad starter. Check to see if da relay is tight to inner fender with no corrosion because the relay's body is ground path via inner fender). If it does turns over jumped to the small terminal, then you'll be looking for something in the small circuit that includes the ignition switch & the park/neutral safety switch (NSS/MLPS) Or clutch safety switch. There should be 12v running from the ignition switch, thru the NSS/MLPS, to the small terminal on the starter relay. Disconnect the small wire to the starter relay (So it doesn't start by surprise, I'd pull the coil wire too). With someone holding the key in the start position, you should be able to read 12v between any point on that small circuit & ground. When you find where you lose 12v, then you'll know where the issue is..."; MIESK5 EDIT; changed a few terms; Also, see Starter (@) Relay Jumping Image in 92-96 @ /gallery_images/StarterRelayJumpinin92-96.JPG - Sewiw shows a remote start switch's Jumpers; you can use a small jumper; MIESK5 NOTE; from Ford EVTM; The Control Module (PCM) runs the pump{s} for one second when it receives an ignition- on signal. It also runs the pumps as long as it receives a PIP signal from the Hall-effect devices, it continues pump operation even after the key is released from START. If the PIP signals fall below 120RPM, the control module cuts off the signal to the fuel pump relay or the integrated relay control module. The pump will also run when the terminals of the fuel pump test connector are jumped. the Control module signals the pump when it receives a CRANK signal, and when the Control module gets PIP signals that the engine is running. the pump does not run if the PIP indicates the engine is not running even with ignition ON {except for that first one second}.
Source: by BigUgly88EB and ElKabong (Ken, El Kabong) at FSB
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No Start Troubleshooting; "...If you can't start the Bronco from the key/cylinder it might be the "upper ignition actuator" has broken in it's track inside the steering wheel OR could be just the key cylinder itself which "pops out" if you look right under it on the metal column collar, there's a little slot and with the key turned to RUN -engine off push up inside with an appropriate tool and comes right out. You can either jump start the vehicle from the "starter relay" under the hood, right inside fender area or pull off the "black plastic cosmetic column shroud" exposing a long 'ROD" and with the key turned to RUN using a set of pliers, drive the ROD downward/forward and the vehicle will start with most key functions intact....i.e, RUN/NO START, OFF/LOCK, AUX..."
Source: by JKossarides ("The Bronco", Jean) at FSB
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No Start, Low State of Battery Charge or Buzzing or Humming Noise from the Fuel Pump after the Engine has been Shut Off Caused by Sticking Fuel Pump Relay TSB 90-18-3 for 83-90 Bronco, Bronco II, Econoline, F-150, F-250, F-350, Ranger & Many Others
Source: by Ford via Chilton
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No Start; "Here is a quick check for no-startcondition. Turn the ignition key to da ON position to see if the “Check Engine Light" (CEL) turns on. If the CEL does NOT Light Up & it has in past before this NO START condition began, check the EEC relay"
Source: by miesk5 at Ford Bronco Zone Forums
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No Start; & Relay Connection pic in 92-96; "...The relay trigger wire (LG/R) comes from the ignition switch via the clutch switch or MLPS and should only be hot with the key in START and either the clutch fully depressed, OR the auto shifter in P or N. The solenoid trigger wire goes to the small terminal on the starter. If the relay fails, bridge between the 2 large studs to send power to the solenoid. If the starter still doesn't spin, crawl under the truck, remove the red plastic cover, and BRIEFLY bridge between the 2 large studs on the solenoid (using a heavy metal object with an insulated grip, like a screwdriver) to spin the starter (it won't engage the flywheel or crank the engine). If it still doesn't spin, replace the starter. 130A & heavier alternators use 2 fusible link wires. The Yellow wire goes to the stud on the side of the power distribution box, and feeds all other factory loads on the vehicle..."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Overview & Diagrams
Source: by Ryan M (FireGuy50) at fordfuelinjection.com
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Panel pic in an 85
Source: by Bronco85 (Phillip H, Big Red) at FSB
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PCM Relay to PCM in PCM Connector Pin-Out Diagram with Circuit Functions in a 96 5.0 and 5.8 (Scroll Down) from 1996 F-150, 250, 350 (4x4), and Bronco Vehicles Workshop Manual
Source: by Ford via thedieselstop.com
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Push Button Start Installation in a 93
Source: by Destructive Mechanic at FSB
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Re-Wiring 460 EFI Swap in a 79; "...OK, as usual, you will need, of course, the engine and accessories (if you want to run a serpentine belt), the computer and wiring harness (preferably out of a late 80'sor early 90's with either a C6 or a Manual Trans, can be either E or F series), as well you will need a fuel system that will be adequate to handle 40+ psi of fuel pressure, and a fuel pump that will deliver that 40+ psi of pressure (recommend a factory pump setup, or an aftermarket hi-pressure in-line fuel pump) (side note: I am taking that you have already taken out the old engine and have done the nessasary steps to install the 460 if the vehicle has not already had a Big Block in it already - 351m and 400 not included as big block). To start, you will need to do some re-wiring in the engine compartment, and also with the engine wiring harness. V+ Constant - Black/Orange - Yellow (EEC Power Relay/Fuel Pump relay). Switched - Red/Lt.Green - White - Grey/Yellow - Brown/White (HEGO,
Coil, EEC Power); Fuel Pump V+ - Pink/Black (or it can be Orange/Lt.Blue); V- - Black/Lt.Green - Black; Starter V+ - Red/Blue (it also connects to the distributor); Coolant Temp Sensor - Red/White, and Oil Pressure Sensor - White/Red; A/C Compressor - Black/Yellow (if you have no A/C, you can hook it up to a switch 12V, and use it as a bit of a high idle, I think that itwill take it up to 1100 - 1200 rpm; Speed Sensor - Dk.Green/White and Grey/Black (I don't use this, I only put this in here so you know about them), I have had no problems with the truck, not running the sensor, it has not kicked up some engine codes and or suffered any problems; Reverse Lights - Black/Pink and or Purple/Orange; Neutral Saftey Switch - Red/Blue; Check Engine Light - Brown, or Brown/Red;Well, that should be all the wiring color codes and attachments....now comes the actual swap..." READ MORE
Source: by Tom (origin, Mr.TroubleMaker) at nelson.macd.ca site via web.archive.org
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Relay Box Location pic in a 93; to the right side of the Power Distribution Box, whose cover is open; miesk5 note, squeeze both sets of tabs together & lift cover off; only 1 Bosch style relay is in there
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Scan Tool Won’t Initiate Self-Tests; malfunctioning Electronic Engine Control (EEC) Relay in a 92; Jeremy wrote on Page 2; "...I was able to get codes the old fashioned way by counting the flashes on dashboard, so I think that would eliminate any prospect of it being something in the wiring; ....As luck would have, it appears that changing out the old EEC relay did the trick. At first I didn't think it would. Instead of using wire from the self test connector to the battery, I plugged it directly into the connector on the tool and went through the KOEO code retreival process and lo and behold I got codes..I even got the KOER test to work as well..."
Source: by Jeremy M (Big '92, jermil01) & miesk5 at FSB
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Starter & Relay Wiring Diagram in 78 Bronco & 76-78 F Series
Source: by Blue79 at photobucket.com
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Starter & Relay Wiring Diagram in 87-89 & F Series
Source: by miesk5 at broncolinks.com/gallery
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Starter for 84 Bronco & F-Series (partial); "...Similar to 80-91 Bronco & F-Series..."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Starter Motor Relay Wiring Harness & Component Location Diagram, Ford Part Numbers, Depictions, etc. from Ford Workshop Manual in 96 Bronco, F-150, F-250, F-350, F-Super Duty Chassis Cab & Motorhome Chassis; use your Browser's SEARCH (or FIND) function to locate what you seek in each Diagram, such as starter, etc.
Source: by Ford via thedieselstop.com
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Starter Relay & Solenoid Parts Break-Out & Wiring Diagrams in 92-96 V8 PMGR (Permanent Magnet Gear Reduction)
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Starter Relay Connection pic in 92-96; "...The relay trigger wire (LG/R) comes from the ignition switch via the clutch switch or MLPS and should only be hot with the key in START and either the clutch fully depressed, OR the auto shifter in P or N. The solenoid trigger wire goes to the small terminal on the starter. If the relay fails, bridge between the 2 large studs to send power to the solenoid. If the starter still doesn't spin, crawl under the truck, remove the red plastic cover, and BRIEFLY bridge between the 2 large studs on the solenoid (using a heavy metal object with an insulated grip, like a screwdriver) to spin the starter (it won't engage the flywheel or crank the engine). If it still doesn't spin, replace the starter. 130A & heavier alternators use 2 fusible link wires. The Yellow wire goes to the stud on the side of the power distribution box, and feeds all other factory loads on the vehicle..."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Starter Relay Connector Location in Engine Bay Diagram in a 90 4.9L Page 1
Source: by Seattle FSB (SeattleFSB) at SuperMotors.net
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Starter Relay Connector Location in Engine Bay Diagram in a 90 5.0 & 5.8 Page 2
Source: by Seattle FSB (SeattleFSB) at SuperMotors.net
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Starter Relay Depiction & Wiring Diagram, PRIOR to 92; "...the only difference is that the battery wire & all the fusible links go to the relay instead of to the solenoid...& 92-96 is functionally identical..."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Starter Relay Ground Wire Addition & Location Video in an 86
Source: by JKossarides ("The Bronco", Jean) at SuperMotors.net
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Starter Relay Location in Engine Bay Diagram in a 90
Source: by Seattle FSB (SeattleFSB) at SuperMotors.net
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Starter Relay Location in Power Distribution Box Diagram in a 95
Source: by Seabronc (Rosie, Fred W) at Ford Bronco Zone Forums
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Starter Relay Location pic in a 96
Source: by Roadkill (The Beast) at SuperMotors.net
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Starter Relay Parts Break-Out Diagram & Corroded Internal Terminal pics in 92-96
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Starter Relay pic in a 90
Source: by ElKabong (Ken, El Kabong) at SuperMotors.net
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Starter Relay pic in a 90 with Wire Identification
Source: by Seattle FSB (SeattleFSB) at FSB
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Starter Relay pic in an 88
Source: by Jem270 at SuperMotors.net
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Starter Relay pic in an 89 5.8
Source: by Handy_andy_cv64 (Ed B) at SuperMotors.net
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Starter Relay pics in a 95
Source: by Shane C. (BigBlue, bigbluebronk) at SuperMotors.net
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Starter Relay Types, Early & Late Model Year pics & Internal Wiring Diagrams; "...The top 2 (late style) use parallel bolts as terminals, so the copper washer inside always touches the flat bolt heads. The others (early style) use bolts perpendicular to the relay's axis, so the washer touches the sides of the bolt heads. But if the bolt is accidentally rotated (as during overtorquing), the washer will only touch a corner, causing high resistance, arcing, and welding. That's why the new style is far superior. The continuous-duty relay has a metal housing to dissipate the heat, and its S2 terminal allows its coil to be fully isolated (for reverse-polarity duty). Note that all Main terminals are electrically interchangeable. But on the newer relays, they are mechanically different in that the plastic housing restricts access to M2 slightly more, indicating that it should have only 1 wire attached. It's common for these to be MISidentified as "solenoids", but a solenoid operates a mechanism, and a starter solenoid is ON the starter; a relay is an electrical switch. Many '90-up Fords have both a starter solenoid & a starter relay, so it's important to differentiate them. If the details or text are too small, click the pic to view the original (super) size..."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Starter Relay Wiring Diagram in 92-95 Bronco & F Series; detailed, from ign sw thru MLPS (called the PARK/NEUTRAL POSITION SWITCH in this diagram) and to relay & starter motor
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Starter Relay Wiring Diagram in 92-96; "NOTE: Disconnecting the start wire at the starter relay with the key on will cause the TFI-IV ICM to revert to start mode timing after the vehicle is started. Reconnecting the start wire after the vehicle is running will not correct the timing. Use the ignition key only to start the vehicle for adjusting base timing."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Starter Relay Wiring Diagram in a 79
Source: by Chilton
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Starter Relay Wiring Diagram in an 83, see #3
Source: by Seabronc (Rosie, Fred W) at Ford Bronco Zone Forums
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Starter Relay Wiring Diagram in an 86
Source: by Xris at SuperMotors.net
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Starter Relay Wiring Diagram in an 89
Source: by Cucamongan (Scotty) at SuperMotors.net
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Starter Relay Wiring Diagram, Haynes for a 78
Source: by Mike S (Broncster, BRONKSTER) at SuperMotors.net
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Starter Relay Wiring Diagrams & pic in an 83
Source: by Seabronc (Rosie, Fred W) at Ford Bronco Zone Forums
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Starter Relay Wiring pic in a 90 with Wire Identification
Source: by Seattle FSB (SeattleFSB) at SuperMotors.net
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Starter Relay Wiring pics in an 80
Source: by REDBEAST9 (The Beast) at SuperMotors.net
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Starter Relay with parallel posts pic; "...This design is superior to the older side-post style primarily because the quality of its contact doesn't depend on the rotation of the main studs, which are splined to prevent rotation anyway. Its contacts self-clean (to a degree, of course), it uses less copper, it takes up less space, and it's easier to bypass if it does fail..."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Starter Wiring Diagram in a 94 from EVTM
Source: by Mikey350 at SuperMotors.net
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Starter Wiring Diagram in an 84
Source: by toddcomputer.com
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Starter Wiring Diagram in an 86 & Ford truck
Source: by Agnem (The Moosestang) at webshots.com
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Starting System Wiring Diagram in a 96, Page 01
Source: by Ford via Chilton
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Starting System Wiring Diagram in a 96, Page 02
Source: by Ford via Chilton
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Symbols in Wiring Diagrams
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Tailgate Relay Location in 78-79; "...Behind the guage/speedo is a relay that powers the inside switch, check it..."
Source: by Zebrafive at FSB
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Tailgate Relay Location in 78-79; "...ok, for the 78-9 People, for us, it is quite easy, under the dash behind the instrument cluster, there is a relay, that relay is to run the main constant power for the rear window when the key is on..."
Source: by origin at FSB
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Testing Wiring with a Multi Meter, General; Opens, Short, Voltage & Voltage Drop, Continuity & Diodes
Source: by freeautomechanic.com
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Testing, Ford (Bosch Type)
Source: by BroncoJoe19 (Joe) at Ford Bronco Zone Forums
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Turn & Hazard Signal Flasher Location in 92-96; "...Turn Signal Flasher Assembly is in front; lower right of fuse panel; Hazard is on the back of da fuse panel, behind the turn signal flasher..."
Source: by miesk5 at FSB
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Wiring Diagram, Haynes for a 78
Source: by Mike S (Broncster, BRONKSTER) at SuperMotors.net
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Wiring Diagrams (Partial, Bronco similar) for F 150 in 86, 89, 91 & 95; EEC, Start/Ignition, EFI/Fuel System, Emissions, E4OD, AOD/C6 (+ clutch interlock switch), etc. from Electrical & Vacuum Troubleshooting Manual (EVTM)
Source: by Ford via Ryan M (Fireguy50) at fordfuelinjection.com
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