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1979 Ford Bronco/F100-F350 Dome, Courtesy, Glove Box & Cargo Light Troubleshooting
Reference · 1978-1979 BroncoAll 48 service procedures
How-it-works and troubleshooting steps for dome/dome-map (Bronco only)/courtesy lights through fuse 7, plus glove box and cargo light diagnosis, with partial wiring snippet.
Part of 1978-1979 Ford Bronco Service Procedures
This is page 24 of a Ford electrical troubleshooting guide covering the dome light, dome-map light (Bronco only), courtesy lights, glove box light, and cargo light circuits. The 'How They Work' section explains that when either door is opened or the light switch knob is turned fully counter-clockwise, power is routed through fuse 7 to the courtesy lights, dome light, and dome-map light; the map light portion is operated through an integral switch. Step-by-step trouble-shooting flows are given for common failures: individual bulbs not working (check bulbs and socket grounds), all interior lights failing (check power at fuse 7), lights not coming on from one door (replace that door's switch), lights staying on with doors shut, and map light failures (continuity test across the map light switch). The glove box light section covers bulb, power, ground, and switch checks. The cargo light section notes it is powered from fuse 7, operated by a B-pillar mounted switch that also operates the dome light, with continuity tests for the cargo light switch. A partial wiring diagram at right shows the cigar lighter and glove box switch/light with wire colors gray/yellow (gr/y) and black (bk) and connector C707.
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Frequently asked questions
- Which fuse powers the dome light, courtesy lights, and cargo light on a 1979 Ford Bronco?
- According to the document, the dome light, courtesy lights, dome-map light, and cargo lamp are all powered through fuse 7.
- What should I check if the dome light and courtesy lights all fail to operate?
- Check for power at fuse 7. If only some lights fail, check for burned out bulbs and for ground at each socket.
- Why do my interior lights work from one door but not the other?
- The guide says if lights fail to come on when either, but not both, of the doors are open, replace the door switch at the inoperative side.
- How does the cargo light work?
- The cargo lamp is powered from fuse 7 and operated by a B-pillar mounted switch; that switch also operates the dome light.
- What do I check if the glove box light doesn't come on when the door is opened?
- Check for a burned out bulb and for power to the switch; if there is power, check for ground at the light; if ground is OK, replace the switch.
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