1970-78 Ford F-Series Chassis Wiring Diagram - Fuse Box, Lights & Charging

This scanned page (page 6-30, 'Chassis Electrical') from an automotive service manual contains two full-page chassis wiring diagrams for Ford F-Series trucks, labeled Fig. 86 and Fig. 87 (sections one and two, approximately 1970-78 F-Series). Section one covers the fuse box (with fuse positions and amperages such as INST LT 3A, FUEL TANK/SEAT BELT 15A, RADIO 7.5A, DIRECT. 20A, HAZ/STOP LT 20A), hazard and directional flashers, stop light switch, ignition switch, light switch, directional switch, instrument panel printed circuit connector, blower motor with resistor and switch, oil pressure and coolant temperature switches, and rear lighting (tail, direction, back-up, license, and marker lights) with wire color codes. Section two covers front lighting (headlights, park lights, marker lights, direction lights), horn relay, beam select switch, battery, fusible link, starter relay and starter, ignition module, distributor, ignition coil, noise filter, back-up light and washer fuses (15A each), neutral/clutch safety switch, windshield wiper motor and switch, washer motor, alternator and alternator regulator. Wire colors (e.g., RED/GRN, BLK/YEL, WHT/BLU) are marked along each circuit, making the page useful for tracing chassis electrical circuits and diagnosing lighting, charging, starting, and wiper faults.