Auxiliary wire to the cab - 2020 AT4

loud_pipes · July 10, 2020

Has anyone run wire from the engine bay to the cab of a 2020 and if so, where did you go through the firewall? I searched but didn’t have any luck. If I missed a thread that already covers this, please point me in that direction.

I am looking to run a switch for auxiliary lights off of a separate harness. My preference is to avoid tapping into the existing fog/head/parking lights.

Thanks!

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Steve Martin · July 10, 2020

I've seen a better pic of this somewhere here, but can't find it. On my 2019 there is a passthrough nub on both driver and passenger side. Some indicate there is no passthrough nub as indicated in this thread. Also, I assume GMC would be the same. I'm familiar with the Chevy.

EDIT I found the pic I made of mine. I haven't had the need to use mine, but I understand you cut this front tab off and it fishes right through or maybe poke a hole big enough for the wire to pass. Then use a bit of sealant at the entry point to seal it up.