Why do my headlights have to be on for my brake lights to work

Asked by May 24, 2015 at 05:24 PM about the 2008 GMC Sierra 1500 SLE1 Ext. Cab 4WD

Question type: Maintenance & Repair

1 Answer

100,495

Wiring problems, best to get a shop with wiring diagrams in it to trace down the problem, most likely it is a ground somewhere.

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