Which fuse controls the instrument panel and control lights on a 1979 Ford Bronco/F-Series?

Fuse 2. Power flows from the rheostat in the light switch to fuse 2, then to the control and instrument cluster lights. If the lights don't operate, check fuse 2.

What should I check if my dash lights are dim or spotty?

The document says to check for burned out bulbs first. If control and instrument cluster lights do not operate at all, check fuse 2.

How do I test the headlight switch dimmer for the instrument lights?

Check for voltage at the light switch dimmer connection (blue and red stripe wire), then turn the light switch knob as if dimming the panel lights and verify voltage varies evenly and lights dim/brighten. If voltage is erratic or zero, replace the light switch.

Where is connector C208 located and what does it look like?

Connector C208 is at the rear of the instrument cluster and is a rectangular, gray connector with 14 terminals.

Where is ground G701 for the instrument lighting circuit?

Ground G701 is attached to the "Y" brace.

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

Ford truck control and instrument lights wiring diagram with rheostat and fuse 2

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Control and instrument cluster illumination wiring: light switch rheostat feeds fuse 2 to cluster lights; includes troubleshooting steps for dim/spotty illumination and a wiring diagram with connector table.

AI caption August 2014 · Photo 26 of 48

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.

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Frequently asked questions

Which fuse controls the instrument panel and control lights on a 1979 Ford Bronco/F-Series?: Fuse 2. Power flows from the rheostat in the light switch to fuse 2, then to the control and instrument cluster lights. If the lights don't operate, check fuse 2.
What should I check if my dash lights are dim or spotty?: The document says to check for burned out bulbs first. If control and instrument cluster lights do not operate at all, check fuse 2.
How do I test the headlight switch dimmer for the instrument lights?: Check for voltage at the light switch dimmer connection (blue and red stripe wire), then turn the light switch knob as if dimming the panel lights and verify voltage varies evenly and lights dim/brighten. If voltage is erratic or zero, replace the light switch.
Where is connector C208 located and what does it look like?: Connector C208 is at the rear of the instrument cluster and is a rectangular, gray connector with 14 terminals.
Where is ground G701 for the instrument lighting circuit?: Ground G701 is attached to the "Y" brace.