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Ford Bronco Fuse Block Wiring Diagram - Fuse Ratings, Blower & Defog Circuits
Reference · 1987-1991 BroncoAll 175 wiring diagrams
Wiring diagram of the fuse block and accessory circuits with amperage ratings, annotated to add a new 5-amp defroster circuit.
Part of 1987-1991 Ford Bronco Wiring Diagrams
This is a photographed page from a Ford factory-style wiring diagram showing the fuse block and associated power distribution circuits, uploaded to a 1988 Ford Bronco gallery as part of a blower motor documentation set. The diagram shows fuse positions and ratings including #1 15A, #5 15A (annotated in red as a "New 5 amp circut"), #9 30A, #10 5A, #4 15A, #8 15A, #11 15A, #12 30A circuit breaker, #14 30A circuit breaker, #15 10A, #16 30A, #17 20A, and #18 15A, plus a 25A fuse with tailgate power window. Circuits depicted include the electric control assembly, instrument cluster, fuel line heater (diesel), HEGO sensor, injection blower relay (4.9L), wiper washer switch, rear defog switch, hazard flasher, electric shift control module (A/T), back-up light switch and lamps, directional flasher, direction/hazard switch, and fuel tank selector switch (diesel). Wire colors such as GRY-YEL, BLK-LT GRN, RED-WHT, PPL-ORG, BLK-PNK, LT BLU-RD, YEL-BLK, and RED-YEL are labeled. Hand annotations show the owner's modification: a wire marked "Cut," a red-drawn "New 5 amp circut" to fuse #5, and "No Defroster for me" indicating the rear defog circuit was repurposed.
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Frequently asked questions
- What fuse ratings are shown in the fuse block on this diagram?
- Visible fuses/breakers include #1 15A, #5 15A, #9 30A, #10 5A, #4 15A, #8 15A, #11 15A, #12 30A (C B), #14 30A (C B), #15 10A, #16 30A, #17 20A, #18 15A, and a 25A fuse with tailgate power window.
- What modification did the owner annotate on this diagram?
- The owner marked a wire "Cut," drew a red line labeled "New 5 amp circut" to fuse #5, and wrote "No Defroster for me," indicating the rear defog circuit was cut and repurposed for a new 5-amp circuit.
- Which circuits are shown connecting to this fuse block?
- Circuits include the electric control assembly, instrument cluster, fuel line heater (diesel), HEGO sensor, injection blower relay (4.9L), wiper washer switch, rear defog switch, hazard flasher, electric shift control module (A/T), back-up light switch and lights, directional flasher, dir/haz switch, and fuel tank selector switch (diesel).
- What wire color feeds the injection blower relay (4.9L)?
- The INJ BLOWER RLY on the 4.9L circuit is shown with a GRY-YEL wire, connecting through a blue (BLU) fusible link.
- What protects the tailgate power window circuit?
- The diagram notes a "25A FUSE W/TAIL-GATE PWR WDO", a 25-amp fuse for the tailgate power window.
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