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Old 07-12-2016, 11:52 PM   #14
mrlobster
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Join Date: Oct 2014
Location: Quesnel, British Columbia
Posts: 80
Re: GMC Headlight Relay Mod

I tested the green wires leading from the firewall and both carry the high beam current when the high beams are turned on. So I'm just going to run a relay for each of them rather than tie the wires in together.
The low beam relay went in without a hitch.
I've replaced the under dash, engine and headlight harnesses with new ones from AAW and they've been awesome. Perfect fit and not a single issue.
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