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FORD BRONCO -> ELECTRICAL; EEC/PCM, Self-Test, wiring diagrams... -> Block Heater
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Although we initially developed this site for 78-96 Big Broncos, information in many Links also applies to F, E Series & Cars
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Installation in an 84 302
Source: by brentusbrutus at Ford Bronco Zone Forums
Installation; "... latter, due to its corrosion resistance. Temporarary rubber freeze plugs are also available. In some climates, and often for diesels in any climate, some freeze plugs are replaced by a block heater; most often with a common plug for 110VAC household power routed to the grille so that it can be plugged into an extension cord overnight..."
Source: by Ford via Steve83 (Steve, That dirty old truck) at
Location in Parts Break-Out Diagram in 4.9, 5.0 & 5.8 w/ Nomenclature
Source: by Steve83 (Steve, That dirty old truck) at
Location pic; "...The factory block heater occupies a freeze plug position..."
Source: by Steve83 (Steve, That dirty old truck) at
Symbols in Wiring Diagrams
Source: by Steve83 (Steve, That dirty old truck) at
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 for 4.9L, 5.0L, 5.8L; use your Browser's SEARCH (or FIND) function to locate what you seek in each Diagram, such as Heater
Source: by Ford via