What years and models does this wiring diagram cover?

The caption states it is the 1987 through 1989 F-Series/Bronco wiring diagram, sheet 6 of 7.

What fuse powers the instrument cluster illumination lights?

The ILLUM LTS circuit connects via pin A4 with an LT BLU-RED wire to Fuse #10.

What wire colors are used on the fuel tank selector switch for gas dual-tank trucks?

The FUEL TANK SEL SW (GAS W/DUAL TANKS) shows YEL-WHT and YEL-LT BLU to the instrument cluster, DK BLU-YEL (front) and BRN-WHT (rear) to the fuel level senders, plus RED and RED-WHT wires.

How is the rear window defogger switch wired?

The REAR DEFOG SW has terminal L (BRN-LT BLU through a BRN fusible link to the rear window defog grid), B (YEL to the ignition switch), I (PPL-ORG to Fuse #5), G (BLK to ground), and S (LT BLU-RED to Fuse #10), with an internal timing circuit.

What circuits connect to the warning buzzer?

The warning buzzer connects to the key switch (BLK-PNK, pin 1), ground (BLK, pin 2), DK GRN-LT GRN (pin 3), RED-YEL (pin 4), BRN-LT BLU (pin 5), the left door switch (RED-PNK, pin 6), and the main light switch (BRN, pin 7).

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1987-1989 Ford F-Series/Bronco Wiring Diagram 6 of 7 - Instrument Cluster & Fuel

1987-1989 Ford F-Series/Bronco wiring diagram sheet 6 of 7 — door switches, alternator, instrument and warning

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Mitchell wiring diagram (6 of 7) for 1987-1989 Ford F-Series/Bronco covering door/jamb switches, alternator, instrument cluster, warning lamps and turn signals.

AI caption January 2006 · Photo 58 of 60

This is page 12-39 from Chapter 12 (Chassis electrical system) of a repair manual, showing sheet 6 of 7 of the 1987 through 1989 Ford F-Series/Bronco wiring diagram (copyright 1994 Mitchell International). The schematic covers the instrument cluster and warning/indicator circuits, including the voltmeter, fuel gauge, tachometer, coolant temperature and oil pressure gauges, engine warning indicators, fuel filter indicator (diesel), 4WD hi/lo indicators, anti-lock brake warning, brake warning, check engine, seat belt, high beam, illumination, turn signal, and charge indicator lights with cluster connector pins (A1–A13, B1–B14) and wire colors. It also details the directional/hazard switch wiring to front and rear turn/stop lamps, the rear window defogger switch and timing circuit, fuel tank selector switch and valve wiring for diesel and gas dual-tank systems, fuel level senders, inertia switch and in-line high-pressure fuel pump, partial radio power/memory/illumination wiring, the warning buzzer (key, door, seat belt inputs), fuel/water separator switch (diesel), glow plug control with wait-to-start and water-in-fuel indicators, and the low vacuum warning switch (diesel). Fuse references include Fuses #1, #5, #8, #10, #11, #15, and #18. Readers can trace wire colors, connector pin numbers, and circuit paths for troubleshooting these systems.

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 caption states it is the 1987 through 1989 F-Series/Bronco wiring diagram, sheet 6 of 7.
What fuse powers the instrument cluster illumination lights?: The ILLUM LTS circuit connects via pin A4 with an LT BLU-RED wire to Fuse #10.
What wire colors are used on the fuel tank selector switch for gas dual-tank trucks?: The FUEL TANK SEL SW (GAS W/DUAL TANKS) shows YEL-WHT and YEL-LT BLU to the instrument cluster, DK BLU-YEL (front) and BRN-WHT (rear) to the fuel level senders, plus RED and RED-WHT wires.
How is the rear window defogger switch wired?: The REAR DEFOG SW has terminal L (BRN-LT BLU through a BRN fusible link to the rear window defog grid), B (YEL to the ignition switch), I (PPL-ORG to Fuse #5), G (BLK to ground), and S (LT BLU-RED to Fuse #10), with an internal timing circuit.
What circuits connect to the warning buzzer?: The warning buzzer connects to the key switch (BLK-PNK, pin 1), ground (BLK, pin 2), DK GRN-LT GRN (pin 3), RED-YEL (pin 4), BRN-LT BLU (pin 5), the left door switch (RED-PNK, pin 6), and the main light switch (BRN, pin 7).