Fog lights on 2002 gmc sierra won,t work. Bulbs are good, relay and switch seem fine and fuse is good. I got them to come on when I put a test light on the negative switch post on the relay//// Help
SOURCE: fog lights on 2002 gmc
GET A TESTER. LOOKS LIKE A SCREW DRIVER BUT HAS A LIGHT AND GATOR CLIP. AND TEST THE SOCKET.
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Fog light install
replace fog light switch
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