Question about 2003 Mercury Grand Marquis
Headlights turn on/off sporadically. When car is sitting in garage and it's dark enough for lights to come on automatically, lights come on and stay on for a few mintues, then go off. Car can sit for 30-45 mintues, and headlights will again come on when car is switched on, then go off again. All other lights function properly--parking lights, blinkers, emergency flashers, dome light, etc.
All fuses have been replaced. Light switch (in column) has been replaced. Light control module has been replaced. Same results.
Could it be a relay? or perhaps the light switch on the dash?
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Posted on Jan 02, 2017
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