What size is the back-up light fuse?

The diagram shows a 15A back-up light fuse, and also a separate 15A back-up/washer fuse near the windshield wiper circuit.

What wire colors go to the blower switch?

The blower switch is shown with RED/BLK, BLU/RED, and BLK/YEL wires, with a BLK/YEL wire to the blower motor through the H-M-L blower motor resistor.

What systems does this chassis electrical diagram cover?

It covers the blower motor, instrument panel printed circuit connector, lighting (headlights, tail, back-up, direction, license, marker, park lights), hazard flasher, stop light switch, ignition switch, directional switch, battery, starter and starter relay, alternator and regulator, fusible link, horn relay, windshield wiper/washer, ignition coil, noise filter, distributor, ignition module, and the neutral/clutch safety switch.

What diagram/drawing numbers appear on these pages?

The left page diagram is numbered 85766101 and the right page diagram is 85766102; the page is labeled 6-30, Chassis Electrical.

Home/ Registry/ Ford/ Bronco/ 1978-1979/ “Bronkster”/ Photo supermotors.net/registry/media/671116

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 September 2008 · Photo 1220 of 1632

This scan shows two facing pages (page 6-30, "Chassis Electrical") from an automotive service reference containing full-chassis wiring diagrams, drawing numbers 85766101 and 85766102. The left diagram covers the interior/lighting circuits: blower motor and resistor, blower switch, instrument panel printed circuit connector (with pin wire colors such as RED/WHT, GRN/BLK, BLU/RED, WHT/RED, ORN, GRN/WHT, WHT/BLU), coolant temperature and oil pressure switches, hazard flasher, stop light switch, light switch, low brake switch, ignition switch, directional switch and flasher, plus tail, back-up, direction, license, and marker lights. It also includes a fuse box legend listing fuse positions and amperages: INST LT 3A, HEATER 30A, FUEL TANK 15A, RADIO 7.5A, SEAT BELT 7.5A, B/U WIPER 15, THROTTLE SOL., ACC. 20A, DIRECT. 15, CTSY/CIG 15, and HAZ/STOP LT 20A. The right diagram covers engine bay/front circuits: battery, starter and starter relay, alternator and regulator, fusible link, headlights and beam select switch, horn relay, windshield wiper motor and switch with 15A back-up/washer fuse, back-up light switch and 15A fuse, neutral/clutch safety switch, ignition coil, noise filter, distributor, and ignition module, with wire color codes throughout. Uploaded to a 1978 Ford Bronco gallery; the document itself is undated.

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Frequently asked questions

What fuses and amperages are shown in the fuse box on this diagram?: The fuse box legend lists: INST LT 3A, HEATER 30A, FUEL TANK 15A, RADIO 7.5A, SEAT BELT 7.5A, B/U WIPER 15, THROTTLE SOL., ACC. 20A, DIRECT. 15, CTSY/CIG 15, and HAZ/STOP LT. 20A.
What size is the back-up light fuse?: The diagram shows a 15A back-up light fuse, and also a separate 15A back-up/washer fuse near the windshield wiper circuit.
What wire colors go to the blower switch?: The blower switch is shown with RED/BLK, BLU/RED, and BLK/YEL wires, with a BLK/YEL wire to the blower motor through the H-M-L blower motor resistor.
What systems does this chassis electrical diagram cover?: It covers the blower motor, instrument panel printed circuit connector, lighting (headlights, tail, back-up, direction, license, marker, park lights), hazard flasher, stop light switch, ignition switch, directional switch, battery, starter and starter relay, alternator and regulator, fusible link, horn relay, windshield wiper/washer, ignition coil, noise filter, distributor, ignition module, and the neutral/clutch safety switch.
What diagram/drawing numbers appear on these pages?: The left page diagram is numbered 85766101 and the right page diagram is 85766102; the page is labeled 6-30, Chassis Electrical.