Trailer brake controller install - 2021 GMC Yukon (late ‘21 build factory wiring issues)

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This video shows how to access the factory wiring for adding an aftermarket trailer brake controller on the 2021 GMC Yukon and Chevrolet Tahoe.
Apparent supply chain issues resulted in a factory female harness not being included on late-build vehicles in mid 2021. This video describes where to find this wiring, which is very hidden and difficult to locate.
Includes a brief overview of how to remove dashboard panels to access wiring and install controller module.
This install features a Curt Spectrum brake controller

Опубликовано:

5 окт 2024

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Комментарии : 13

@brysonhopkins99 Год назад

Thanks for your help. Locating the wires was a huge pain in the A!!!

@tpiguy Год назад

Great help. I was able to pull it out the front to wire it in.

@alexdreychan566 Год назад

Body thank you for the video You saved my day

@aroelrecio2124 2 года назад

Great video I'm doing mine tomorrow

@bobbywood1136 3 года назад

John, can you tell me which wires off the 8806 harness match up with the Curt Spectrum controller? What a mess! Thanks for your video. Bobby D

@jgh7713 2 года назад

Sorry, what's the 8806 harness? I just matched up the wires as described on the wiring pigtail to the corresponding functions on the Curt controller pigtail - note that the colors will NOT necessarily match each other.

@nicocastillo2446 2 года назад

We would all benefit if you showed what color wires matched to the spectrum wires. Doing mine and what a headache.

@jgh7713 2 года назад

Given the production variability, I wouldn't be surprised if wire colors on the truck side change between model years or even within the same model year, given supply chain inconsistencies. So you'll need to refer to the wiring tag found on the vehicle loom and match it up to what the Curt manual says. They are not color matched.

@dylanstree2222 3 года назад

I found the same set of four wires, however they are dead wires and is there a place you found that it should hook up to the battery or fuse?

@jgh7713 2 года назад

Sorry, don't have an answer for that problem - they should be live - may want to check fuses. Otherwise I'd take it to the dealer if you can't get power.

@brandonsamatowitz 2 года назад

I hooked up and no power going to controller. Is there a fuse or relay that you need?

@jgh7713 2 года назад

Check fuse #63 under the hood (p. 333 in the manual bit.ly/3BCgLJa). If that's OK test the wires for power. May have to have key-on or power-on for them to be live.

@5acre5chi 2 года назад

Dude what a shit show this wiring is. I’m searching for a connector and the same. 2022 Yukon and have black duct tape covering my wires on the vehicle side. Not gmc quality I was expecting for sure. :/