1976-78 Ford F-Series Chassis Wiring Diagram - Dash, Fuse Box & Engine Circuits

This scanned page (page 6-30, 'Chassis Electrical') from an automotive repair manual contains two chassis wiring diagrams for 1976-78 Ford F-Series trucks: Fig. 86 'section one' (diagram 85766101) and Fig. 87 'section two' (diagram 85766102). Section one covers the interior/dash side of the harness: blower motor, blower resistor and switch, coolant temperature and oil pressure switches, instrument panel printed circuit connector (with its wire color list), hazard flasher, stop light switch, light switch, low brake switch, ignition switch, directional switch and flasher, marker/tail/back-up/direction lights, and the fuse box with individual fuse positions and amperages (INST LT 3A, HEATER 35A, FUEL TANK 15A, RADIO 7.5A, SEAT BELT, THROTTLE SOL., B/U/WIPER 15, ACC. 20A, DIRECT. 15, CTSY/CIG. 15, HAZ/STOP LT. 20A). Section two covers the engine compartment and lighting side: battery, starter relay, starter, alternator and regulator (A+, S, F, I terminals), fusible link, headlights and beam select switch, horn relay and horns, washer motor, windshield wiper motor and switch, 15A back-up/washer and back-up light fuses, back-up light switch, neutral/clutch safety switch, ignition coil, noise filter, distributor, and ignition module. Wire color codes (e.g., BLK/YEL, RED/GRN, PPL/WHT) are labeled throughout, making this useful for tracing circuits and diagnosing electrical faults.