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1978 Ford Bronco Chassis Wiring Diagram - Lighting, Charging & Wiper Circuits

Scanned chassis-electrical service manual page showing two automotive wiring diagrams with circuit routing and connectors.

AI caption · Photo 1219 of 1632

This is a scanned page from a chassis electrical section of an automotive service manual, containing two full-page wiring diagrams printed sideways. The upper diagram covers the lighting, instrument panel, and heater/blower circuits, showing the hazard flasher, stop light switch, fuse box, blower motor and resistor, blower switch, instrument panel printed circuit connector, light switch, ignition switch, low brake switch, and the rear lighting (back-up, license, tail, direction, and marker lights), with wire color codes such as RED/GRN, WHT/RED, BLK/YEL, and BRN/YEL. The lower diagram covers the headlight, charging, starting, and windshield wiper circuits, including the headlights, horn relay, beam select switch, battery, fusible link, starter relay, starter, alternator and alternator regulator, distributor, ignition coil with noise filter, neutral/clutch safety switch, back-up light switch, windshield wiper motor and switch, and washer motor. Two 15-amp fuses are labeled for the back-up light and washer circuits. Numerous 'To...' callouts identify circuit destinations such as the ignition switch, EGR system, direction switch, and high beam indicator. The page footer reads 'CHASSIS ELECTRICAL.' A reader can use this page to trace wire colors and component connections for lighting, charging, starting, and wiper systems, though the scan's small sideways print limits full detail.

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Frequently asked questions

What circuits are shown on this wiring diagram page?
Two diagrams: one covering lighting, instrument panel, and heater/blower circuits (hazard flasher, stop light switch, blower motor and resistor, light switch, ignition switch, tail/back-up/license/direction/marker lights), and one covering headlights, horn relay, battery, starter relay, alternator/regulator, distributor, ignition coil, and windshield wiper/washer circuits.
What fuse ratings are shown for the back-up light and washer circuits?
Both the back-up light fuse and the washer fuse are labeled 15A in the lower diagram.
What wire colors run to the blower motor?
The blower motor circuit shows BLK/YEL wiring at the motor, with the blower switch connecting via RED/BLK, BLU/RED, and BLK/YEL wires through the blower motor resistor.
Does the diagram show a fusible link?
Yes, a fusible link is shown near the battery/starter relay in the charging and starting circuit diagram.
What safety switch is in the starting circuit?
A neutral/clutch safety switch is shown, along with the starter relay and back-up light switch.

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