Duramax Diesels Forum Truck of the Week
Old 10-05-2018, 07:21 PM
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ironmax ironmax is offline
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Join Date: Jul 2010
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Default Electrical gremlins

For some reason I have lost my back up lights. All fuses are good, and when I send power through the fuse the lights turn on. Is there any power going to either fuse before the truck is shifted into reverse? Because I have none.. just wandering. Is the next logical spot to check the nsbu? Which wire is the signal wire from the trans?.

I also fried some thing to my brake controller and third brake light while trying to diagnose my wiring issue for the reverse lights. I pulled the nsbu and said screw it and started shoving power to anything that wasn't already hot hoping to fire up the reverse lights. Now the brake controller won't fire up by the signal wire from the brake switch, nor does my third brake light. But if I manually engage the controller my third brake light comes on aswell as the controller. I have no other lighting issues other that those. Where should I start looking.

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