GMC Troubleshooting Questions? Ask a Mechanic for Answers
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Check to see if dark green wire going to drivers window switch has power, let me know. Thanks.
Do any of the windows work?
The dark green wire should have power, the dark green wire going to both of the front switches get power from the same source so if no power at wire on passenger side this would mean wire is broken in door jam. Let me know how it goes or if you have more questions, thanks.