GMC Troubleshooting Questions? Ask a Mechanic for Answers
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Do you have a trailer connection on this vehicle?
I would think you have a ground problem.
My suspicion would be when they check the connector the ground appears OK, They need to repair the ground and test with a high amperage bulb.
the trailer connector is in the same circuit and can cause problems. It should be inspected and corrected as needed.
Electricity will take the path of least resistance. If the trailer connector has corrosion and causing a easier path it will go that way instead.
I really think you have a ground problem. Probably above the spare tire
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