What years and models does this wiring diagram cover?

The diagram is labeled '1990 and 1991 F-Series/Bronco wiring diagram (6 of 10)', so it covers 1990-1991 Ford F-Series trucks and Broncos.

What fuse ratings are shown in the fuse block on this diagram?

Fuse #1 15A, #4 15A, #5 15A, #6 15A, #8 15A, #9 30A, #10 5A, #11 15A, #12 30A (circuit breaker), #14 30A, #15 10A, #16 30A, #17 20A, and #18 15A.

What wire colors feed the ignition switch terminals?

BATT terminals use YEL wires; P1 is PPL-WHT; P2 is BLK-LT BLU; I2 is BRN-PNK; A1 is BLK-LT GRN; I1 is RED-LT GRN; ST is RED-LT BLU; and A2 is GRY-YEL.

What circuit numbers connect to the warning chime module?

The warning chime module shows RED-YEL 640, BRN 14, BLK-PNK 158, RED-PNK 159, DK GRN-LT GRN 450, BRN-LT BLU 85, and BLK 57.

Which circuits are specific to the Bronco on this diagram?

The tailgate window switch and rear defogger circuits are noted as (BRONCO); the overdrive switch on PPL-ORG is marked (EX BRONCO).

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1990-1991 Ford F-Series/Bronco Wiring Diagram (6 of 10) - Fuse Block & Ignition

Chassis electrical wiring diagram page from a Bronco/F-Series manual

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Scanned chassis electrical wiring diagram (sheet 8 of 10) showing circuits, connectors and wire callouts.

AI caption July 2016 · Photo 8 of 12

This is page 12-47 from Chapter 12 (Chassis electrical system) of a Haynes/Mitchell-sourced repair manual, showing the '1990 and 1991 F-Series/Bronco wiring diagram (6 of 10)' (© 1994 Mitchell International). The diagram traces circuits from the ignition switch (with terminals BATT, P1, P2, I1, I2, A1, A2, ST and positions ACCY/LOCK/OFF/RUN/START) through the fuse block, showing fuse positions and ratings: #1 15A, #4 15A, #5 15A, #6 15A, #8 15A, #9 30A, #10 5A, #11 15A, #12 30A (CB), #14 30A, #15 10A, #16 30A, #17 20A, #18 15A. Wire color codes are labeled throughout (e.g., BLK-LT GRN, RED-LT GRN, LT BLU-RED, PPL-ORG, YEL-LT BLU). Circuits covered include the RABS module, cruise control module, warning indicators, EEC power relay, tailgate window switch (Bronco), electronic shift control module, power door locks, power windows, radio, cigarette lighter, hazard/direction flasher, main light switch with dimmer, headlights, beam select switch, warning chime module (with circuit numbers 640, 14, 158, 159, 450, 85, 57), back-up light switch, oxygen sensor (HEGO), horn relay, and trailer/marker light relay. Gas and diesel variants are distinguished, as are manual/automatic transmission options.

This document covers 1990-1991, which may differ from this 1993 Ford Bronco.

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Frequently asked questions

What years and models does this wiring diagram cover?: The diagram is labeled '1990 and 1991 F-Series/Bronco wiring diagram (6 of 10)', so it covers 1990-1991 Ford F-Series trucks and Broncos.
What fuse ratings are shown in the fuse block on this diagram?: Fuse #1 15A, #4 15A, #5 15A, #6 15A, #8 15A, #9 30A, #10 5A, #11 15A, #12 30A (circuit breaker), #14 30A, #15 10A, #16 30A, #17 20A, and #18 15A.
What wire colors feed the ignition switch terminals?: BATT terminals use YEL wires; P1 is PPL-WHT; P2 is BLK-LT BLU; I2 is BRN-PNK; A1 is BLK-LT GRN; I1 is RED-LT GRN; ST is RED-LT BLU; and A2 is GRY-YEL.
What circuit numbers connect to the warning chime module?: The warning chime module shows RED-YEL 640, BRN 14, BLK-PNK 158, RED-PNK 159, DK GRN-LT GRN 450, BRN-LT BLU 85, and BLK 57.
Which circuits are specific to the Bronco on this diagram?: The tailgate window switch and rear defogger circuits are noted as (BRONCO); the overdrive switch on PPL-ORG is marked (EX BRONCO).