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1987-91 Ford F-Series & Bronco Chassis Wiring Diagram - Exterior Lights
Reference · 1980-1986 BroncoAll 92 wiring diagrams
Manual chassis wiring diagram for 1987-91 Ford F-Series/Bronco with multifunction switch, lamps and color-coded circuits.
Part of 1980-1986 Ford Bronco Wiring Diagrams
This is page 12-50 from Chapter 12 (Chassis electrical system) of a Haynes-style repair manual, showing a chassis wiring diagram captioned "Chassis wiring - 1987-91 F-Series and Bronco." The diagram covers exterior lighting circuits: the main light switch (fed by Fuse Link L and Fuse 4, 15A), dimmer switch, brake on/off switch, hazard flasher (Fuse 1, 15A, with different routing for 1991 vs. 1987-90), turn flasher (Fuse 5, 15A, hot in run), and the multi-function switch. It traces wire colors (e.g., LT GRN/WHT, LT GRN/ORG, WHT/LT BLU, ORG/LT BLU, BRN) to the left/right turn indicators, front park/turn lamps, rear park/stop/turn lamps, license lamps, headlamps, hi-beam indicators (1987-89 and 90-91 with/without DRL), and cab/side/rear body marker lamps. Also shown are the trailer/marker lamps relay with fuse links P, H, and G (year-dependent: 1987 & 1991, 1988, 1989-90), the daytime running lights module (1990-91), backup lamp switch (manual transmission), park/neutral position switch (automatic transmission), and backup lamps. A reader can identify fuse ratings, fuse link letters, wire color codes, and ground points for these lighting circuits.
This document covers 1987-1991, which may differ from this 1986 Ford Bronco.
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Frequently asked questions
- What fuse powers the turn signal flasher on 1987-91 Ford F-Series and Bronco?
- Fuse 5, a 15A fuse that is hot in run, feeds the turn flasher through a PPL/ORG wire.
- What fuse feeds the hazard flasher?
- Fuse 1, 15A, hot at all times. For 1991 it routes through a RED/WHT wire; 1987-90 routing is shown separately to the hazard flasher.
- Which fuse links feed the trailer/marker lamps relay?
- Fuse Link P for 1987 & 1991, Fuse Link H for 1988, and Fuse Link G for 1989-90, all through a YEL wire.
- What wire colors go to the headlamps?
- Both left and right headlamps are fed by LT GRN/BLK and RED/BLK wires with BLK grounds; the hi-beam indicator (90-91) uses a GRY/WHT wire with/without DRL.
- What years did the Daytime Running Lights module apply to?
- The diagram labels the Daytime Running Lights Module as 1990-91, with inputs including LT GRN/BLK, LT GRN/RED, GRY/WHT, RED/BLK, PPL/ORG and PPL/WHT.
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