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Posted (edited)

When the truck is off and not running the headlights work perfectly fine. But once I turn the engine over and it’s running the headlights cut off. Once the truck is shut off the headlights work again. Just get the truck not tool long ago and it was working fine until last night. I’ve checked the relay but can’t locate the fuse. Any info would help a lot! 2014 GMC Sierra 1500 SLE

Edited by CalvinCody
Added truck year and model

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