What years and models does this wiring diagram cover?

The page states it is the '1987 through 1989 F-Series/Bronco wiring diagram (1 of 7)', so it covers 1987–1989 Ford F-Series trucks and Broncos.

Where is the fuse block located on this wiring diagram set?

The component locator lists the FUSE BLOCK at grid coordinates B-C 13-14.

What circuits are shown on this first sheet?

It shows the battery, starter, starter relay, alternator (gas and diesel), regulator, glow plug control and glow plugs, fuel line heater, fuel shut-off solenoid, cold idle and cold advance solenoids, cooling fan motor, coolant fan temp switch (170°F), injector blower relay (4.9L), horns, headlights, beam select switch, marker lights, and engine compartment light.

Where is the EEC power relay in the diagram set?

The component locator lists the EEC POWER RELAY at A 5 and A 9.

What wire colors connect to the gas alternator?

The gas alternator shows BLK-ORG to B+ terminals, WHT-BLK to S, YEL-WHT to A, and LT GRN-RED to I.

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1987-1989 Ford F-Series/Bronco Wiring Diagram 1 of 7 - Component Locator

1987-1989 Ford F-Series/Bronco wiring diagram sheet 1 with component locator and battery/charging circuit

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Mitchell 1987-1989 F-Series/Bronco wiring diagram (sheet 1): alphabetical component-locator index plus battery, starter, alternator and cooling-fan circuits.

AI caption January 2006 · Photo 53 of 60

This is page 12-34 from Chapter 12 (Chassis electrical system) of a Haynes-style repair manual, showing sheet 1 of 7 of the 1987 through 1989 Ford F-Series/Bronco wiring diagram (copyright 1994 Mitchell International). The left column contains a complete component locator index listing electrical components alphabetically (A/C system through windshield wiper switch) with their grid coordinates (letters A–E and numbers) across the 7-sheet diagram set. The diagram itself covers the starting and charging circuits for both gas and diesel engines: batteries, starter, starter motor, starter relay, gas and diesel alternators, voltage regulator, glow plug control and glow plugs (diesel), fuel line heater, fuel shut-off solenoid, cold idle and cold advance solenoids, engine temperature switch, cooling fan motor and coolant fan temp switch (170°F), injector blower relay (4.9L), timing circuit, horns and horn relay/switch, headlights and beam select switch, marker lights, dir/haz switch, radio noise capacitor, VIP test connector, and engine compartment light. Wire colors are labeled throughout (e.g., BLK-ORG, RED-LT BLU, YEL-WHT, LT GRN-RED), along with fuse references (Fuse #1, Fuse #16) and fusible links. A reader can locate any electrical component on the diagram set and trace wire colors for starting/charging/glow plug circuits.

This document covers 1987-1989, which may differ from this 1985 Ford Bronco.

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Frequently asked questions

What years and models does this wiring diagram cover?: The page states it is the '1987 through 1989 F-Series/Bronco wiring diagram (1 of 7)', so it covers 1987–1989 Ford F-Series trucks and Broncos.
Where is the fuse block located on this wiring diagram set?: The component locator lists the FUSE BLOCK at grid coordinates B-C 13-14.
What circuits are shown on this first sheet?: It shows the battery, starter, starter relay, alternator (gas and diesel), regulator, glow plug control and glow plugs, fuel line heater, fuel shut-off solenoid, cold idle and cold advance solenoids, cooling fan motor, coolant fan temp switch (170°F), injector blower relay (4.9L), horns, headlights, beam select switch, marker lights, and engine compartment light.
Where is the EEC power relay in the diagram set?: The component locator lists the EEC POWER RELAY at A 5 and A 9.
What wire colors connect to the gas alternator?: The gas alternator shows BLK-ORG to B+ terminals, WHT-BLK to S, YEL-WHT to A, and LT GRN-RED to I.