GMC Troubleshooting Questions? Ask a Mechanic for Answers
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
If these after market lights have a control unit/ecu the fault can be in the control unit/ecu itself and it may need replaced to correct this issue here.I would double check that the lights are all wired and connected properly.If these are all checked and found to be o.k. this can be an issue with the control unit for these lights needing replaced.If you can tell me the model/make of the light system installed I may be able to find more info on this here just let me know.
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