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Check all the fuses, if they are good you have a bad backup light switch, are a broke wire. From Hi, I just had the same problem the backup light would come on now and then. I didn't really noticed it until I had hooked up a towed vehicle with actuated brake system and a back up cut off switch. I couldn't back up the trailer when the back up light wasn't getting power. I traced everything down to the backup switch, I replaced it and everything worked out fine. The switch is connected on your tranny, there is a slightly different one for the automatic tranny vs the manual one. JQ Dancing on the edge

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โˆ™ 2006-09-03 19:16:17
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Q: What would cause backup lights on 1997 gmc pickup not to work No power at the bulb socket?
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