Lights doesn't work

Asked by Mar 04, 2019 at 10:23 AM about the 1977 Ford F-100

Question type: Maintenance & Repair

My headlights doesn't come on all of a sudden
what could be possibly wrong

2 Answers


If it's not the bulbs, possible causes are bad headlight relay, fuse, module, headlight switch, dimmer switch or wiring. You need to track down the problem.


In 1977 there are fuselinks right by the starter solenoid on the passenger inner fender right where the positive battery cable is connected, check those first, if those check good then move onto the dimmer switch, these have been known to stick between modes even thought it may click it may not be working, then the headlight switch, usually these will cycle the headlights on and off just before they go bad but sometimes they just quit.

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