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After market trailer brake controller

Tiny
ROMALOOCH
  • MEMBER
  • 2011 GMC YUKON
  • 6.2L
  • V8
  • AWD
  • AUTOMATIC
  • 90,000 MILES
I have a XL Denali. I just bought this vehicle and it does not have an integrated brake controller so I bought an after market trailer brake controller and installed it on the vehicle. The vehicle did come pre-wired for a brake controller so the wires were already under the dashboard. I hooked it up and everything works great except the wire from the vehicle that is suppose to be for the brake switch is wired hot meaning there is power to it all the time and the brakes on the trailer are fully applied. This wire is only suppose to get power through the brake switch when the brake pedal is applied. Anybody ever heard of this before?
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Saturday, June 17th, 2017 AT 6:03 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hello,

It sounds like you have the wrong wire connected to the trigger for the controller. Here is a wiring diagram so you can get the right wire.

It looks like it is light blue with white

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken
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Sunday, June 18th, 2017 AT 10:37 AM

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