GMC Troubleshooting Questions? Ask a Mechanic for Answers
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There is a rubber grommet on the drivers side of firewall where factory wire harness goes through. You can cut a little slit in the rubber grommet and slide wire through, this is what I've done in the past without any problems. Then I usually run wire under the door sills to get it from front of vehicle to back of vehicle. Let me know if you have questions, thanks.
Sounds good, thanks.
Ever get it figured out? Please do not forget to rate answer, thanks.