What wire colors connect to the blower switch?

The blower switch shows RED/BLK, BLU/RED, and BLK/YEL wires, with a BLK/YEL wire running to the blower motor through the blower motor resistor (H, M, L terminals).

What is the rating of the back-up/washer fuse and back-up light fuse?

Both are shown as 15A — a 15A back-up/washer fuse near the windshield wiper circuit and a 15A back-up light fuse feeding the back-up light switch.

What wire colors run to the windshield wiper motor and switch?

The wiper motor shows BLU and BLK/WHT wires; the wiper switch shows WHT/BLK, WHT/ORN, RED, and WHT/BLK wires.

Which components are shown in the starting and charging circuits?

The right page shows the battery, starter relay (with BLK/YEL, BLK and BRN wires), starter, alternator (BLK/RED, ORN, WHT/BLK), alternator regulator with A, S, F, I terminals, and a fusible link feeding toward the ignition switch.

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1978 Ford Bronco Chassis Electrical Wiring Diagram - Fuse Box & Wire Colors

Scanned 6-30 Chassis Electrical manual page with blower, lighting, and wiper wiring diagrams

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Scanned chassis-electrical manual page detailing blower motor, lighting, ignition, and wiper wiring circuits with color codes.

AI caption January 2008 · Photo 824 of 1632

This two-page scan (page 6-30, "Chassis Electrical") shows a complete chassis wiring diagram for a Ford truck, uploaded to a 1978 Ford Bronco gallery. The left page covers the interior/rear circuits: blower motor, blower motor resistor and blower switch; instrument panel printed circuit connector with its wire colors; coolant temperature and oil pressure switches; hazard flasher, stop light switch, light switch, low brake switch, ignition switch, directional (turn signal) switch and directional flasher; tail, back-up, direction, license, and marker lights. It includes the fuse box legend listing fuse positions and ratings: INST LT 3A, FUEL TANK 15A, SEAT BELT 7.5A, THROTTLE SOL, CTSY/CIG 15, HEATER, RADIO 7.5A, B/U WIPER 15, ACC 20A, DIRECT 15, and HAZ/STOP LT 20A. The right page covers the engine compartment and front lighting: battery, starter and starter relay, alternator and alternator regulator, fusible link, headlights and beam select switch, horn relay and horns, windshield washer motor, wiper motor and wiper switch (with 15A back-up/washer fuse), back-up light fuse (15A) and switch, neutral/clutch safety switch, ignition coil, noise filter, distributor, and ignition module. Wire color codes (e.g., BLK/YEL, RED/GRN, GRN/BLK) are labeled throughout, making it useful for tracing circuits and diagnosing electrical faults.

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Frequently asked questions

What fuses and amp ratings are shown in the fuse box on this diagram?: The fuse box legend lists: INST LT 3A, FUEL TANK 15A, SEAT BELT 7.5A, THROTTLE SOL, CTSY/CIG 15, HEATER, RADIO 7.5A, B/U WIPER 15, ACC 20A, DIRECT 15, and HAZ/STOP LT 20A.
What wire colors connect to the blower switch?: The blower switch shows RED/BLK, BLU/RED, and BLK/YEL wires, with a BLK/YEL wire running to the blower motor through the blower motor resistor (H, M, L terminals).
What is the rating of the back-up/washer fuse and back-up light fuse?: Both are shown as 15A — a 15A back-up/washer fuse near the windshield wiper circuit and a 15A back-up light fuse feeding the back-up light switch.
What wire colors run to the windshield wiper motor and switch?: The wiper motor shows BLU and BLK/WHT wires; the wiper switch shows WHT/BLK, WHT/ORN, RED, and WHT/BLK wires.
Which components are shown in the starting and charging circuits?: The right page shows the battery, starter relay (with BLK/YEL, BLK and BRN wires), starter, alternator (BLK/RED, ORN, WHT/BLK), alternator regulator with A, S, F, I terminals, and a fusible link feeding toward the ignition switch.