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Could be a number of things... like do they just quit when ur going down the road... when the wiring gets hot the switch that turns the light on and off has a fuse, something like a house, when it gets to hot it will kick off and when cool down it will come on, could be a bad switch, or a problem in the wiring... if it just wont come on could be ground, switch, or dimmer switch.

It's rare its a bad fuse,headlight switch,or wiring inless you smelled or seen smoke coming from the dash area. If you did then you have a short in the wiring or a bad headlight switch- every time i have fixed this kind of problem it has only been the high beam / low beam switch. Locate the high/low switch, most are on the sterring column under the dash. Ford trucks are left side of the floor board. Pull the (3) wire harness out the switch. Get a jumper wire and connect to the center of the harness to either side of the harness- one side will be high beam the other will be low beam,then turn on your headlight switch and test.... the headlights should turn on. note: do not leave jumper wire its just a test - turn off the headlight switch,replace the high/low beam switch and plug your harness and your done.

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Q: Why do both headlights stop working at the same time?
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