1981 Ford F-Series Wiring Diagram Part 1 - Fuse Box, Lights & Ignition Circuits

This document is a scanned page (12-19) from Chapter 12, "Chassis electrical system," of an automotive repair manual, showing the wiring diagram titled "1981 F-Series Pick-up - Part 1." The schematic covers the windshield wiper/washer switch and washer motor, blower motor and resistor (H/M/L terminals) with blower switch, coolant temperature and oil pressure switches, seat belt timer/warning buzzer, instrument panel printed circuit connector pinout, light switch, hazard and directional flashers, stop light switch, back-up light switch, low brake switch, ignition switch, directional/horn/hazard switch, and exterior lighting (marker, tail, direction, back-up, and license lights). Wire color codes are labeled throughout (e.g., BLK/GRN to ignition switch, BLK/PNK to back-up lights, ORN/Lt.BLU to direction switch). A detailed fuse box legend is included with positions and ratings: 20A HAZ/STOP LTS, 15A DIR/B-U, HEATER circuit breaker, 10A WIPER, 10A RADIO, PWR WDS circuit breaker, 10A AUX FUEL TANK, 15A EMISSION, 5A INST LTS, PWR ACCY circuit breaker, 15A TAIL LT, 15A CTSY LT, and 20A HORN/CIG. A reader can trace circuits by wire color, identify fuse amperages, and locate switch connections for a 1981 Ford F-Series truck.