1979 Ford Bronco F100-F350 Control & Instrument Lights Wiring Diagram

This page, page 26 of a multi-page wiring diagram set filed for 1979 Ford Bronco and F100-F350 trucks, covers the Control and Instrument Lights circuit. It explains circuit operation: when the light switch is pulled to the first or second position, power feeds through the rheostat inside the light switch, then to fuse 2, and from fuse 2 to the control and instrument cluster lights. A trouble-shooting flowchart guides diagnosis: check for burned-out bulbs if illumination is dim or spotty, check fuse 2 if lights don't operate, verify voltage at the light switch dimmer connection (blue/red stripe wire), and replace the light switch if voltage is erratic or zero. The color wiring diagram shows the headlight switch, fuse 2, headlamp switch/wiper-washer controls illumination light, A/C & heater controls illumination light, cluster illumination lights, I/P ash tray illumination light, PRNDL column illumination light, and radio receiver indicator light, with wire colors (bk/o, bl/r, bk), connectors C208, C305, C506, C513, C601, C713, splices S805 and S806, and ground G701. A component location table lists where each connector, splice, and ground is found and describes each connector's shape, color, and terminal count.