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Re: why would my center top brake light work but the ...
I have replaced many of these. it is the multifunction switch under steering wheel cover.the third brake light is on different circuit .so replace muti switch and you will fix your problem thanks please rate this answer
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I think your trouble is in the turn signall switch, just had the same trouble on my truck. Turn signall switch is about $250 because it is actually turn signalls, wipers, washers, 4 ways, and dimmer all in one.
Do the non working bulb holders have power at the bulb terminals?If not back track to the one that works.The flow of power or earth is bad and its probably happening between working and non working.Do you have a trailer plug?make sure the joins are secure.Maybe two wires touching?Have you put an earth to one of the bulb holders that dont work.Try taking the working bulb out and see if the others light up,Hard to do or suggest test without vehicle there to work on and makes it hard not knowing exactly what tests youve done but suggested a couple in the hope that theres something that helps.Good luck
My fiancee' followed Ron's instruction, on where to find the brake light switch, and was finally able to locate it, get it out, and replace it with a new one. I now have brake lights. He had been looking all morning for the switch but could not find it, and he is an ace mechanic, so thanks to Ron for his expert advice. You guys are the greatest!!
I had the same problem with my 2001. I found it was the multi function switch. Better known as your turn signal switch. I found that the hazard switch portion of it had shorted. replacement is fairly easy, aftermarket part is available, much cheaper than GM.