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Aftermarket Brake Control Wiring for 07-13 GM Full-Size Truck with Factory-Integrated Brake Control

Technical Bulletin

Wiring an aftermarket brake control to the following models:
  • 2007-2014 Cadillac Escalade Models
  • 2007-2013 Chevrolet Avalanche, Silverado
  • 2007-2014 Chevrolet Suburban, Tahoe
  • 2014 Chevrolet Silverado 2500/3500
  • 2007-2013 GMC Sierra
  • 2007-2014 Yukon Models
  • 2014 GMC Sierra 2500/3500
  • 2008-2010 Hummer H2 with Integrated Trailer Brake Controller
Problem: Installer needs new instructions (following).Solution: When installing an aftermarket brake control into a truck that is equipped with a factory Integrated Trailer Brake Control (ITBC), you will have to make the following connections. The 2007-2013 models have four or five blunt-cut wires under the left side of the instrument panel. These wires are located above your left shin as you are seated in the driver's seat. The wires can be identified by a white label and the color of the wires. The wire colors are (1) Red/Black wire, (1) White wire, (1) Light Blue/White wire and (1) Dark Blue wire, and possibly (1) Orange wire. See Fig. 1.
GM Truck Brake Control Wiring
Custom Fit Brake ControllerSelect your vehicle to confirm the Brake Controller fit
Connect the brake control to these wires as follows:
  • GM Wire to Brake Control Wire Function
  • Red/Black to Black Battery Power
  • White to White Ground
  • Light Blue/White to Red Brake Light Signal
  • Dark Blue N/A Brake Control Output to Trailer
  • Orange N/A Center High Mount Stop Lamp (CHMSL)
Using enough 12-gauge Blue wire to reach the rear of the truck, connect one end to the Blue wire on the aftermarket brake control. Run the other end of the Blue wire in conduit or loom to the 7-way trailer connector. At the 7-way trailer connector you will have to remove some tape and pull back the plastic loom to access the factory-installed Blue wire. Cut the factory Blue wire approximately 4 to 6 inches from the trailer connector. See Fig. 2.
wiring at the back of the vehicle
Connect remaining end of Blue wire from aftermarket brake control to the Blue wire going to the trailer connector. After connection is made, heat shrink, reinstall plastic loom and re-tape loom.To complete the installation, two wires under the hood have to be connected. One is the power supply wire to the aftermarket brake control. The other is the battery charge line to the 7-way connector. These wires are both Red/Black with eyelets connected to them. They are coiled up under the hood and must be connected to the under-hood fuse box. The brake control power wire is located between the fuse box and the left (driver's side) fender. The battery charge wire is located under the master cylinder/brake booster assembly. See Fig. 3
Fuse box under the hood
The battery charge wire will go on the smaller Black stud, and an M6X1.0 metric nut is required to attach the wire to the stud. Larger posts require an M8 nut. The brake control wire will go on the larger Silver stud along with the existing Red wire. The existing Red wire is the power wire for the factory brake control and does not need to be removed.Important: Raising the Gray handle above the studs more than 3/8 of an inch will result in the fuse box becoming disconnected from the electrical connector.If disconnection occurs, you may have to consult your local GM dealership for repairs.Note: According to GM Corporate Document Number 07-08-45-001, this will not result in any trailer brake display message showing on the driver information center.Product Number:Manufacturer: Draw-Tite, Hidden Hitch, Reese,Tow-ReadyBulletin Date: 02/16/08Bulletin Number: 08-0100

Questions and Comments about this Article

Will this work on a 2015 GMC sierra 2500 Denali Duramax because I don’t have the studs on the fuse box is there a way to put an aftermarket brake controller on this one
Etrailer Expert
Reply from David B.

I can def help you out Kevin....Just need some more information. Do you already have a brake controller, if so what brand and model. Does the 2500 Sierra already have a factory/OEM tow package?

@Terry...Did you figure out how to get the "service trailer brake system" message off? Having same message after following the directions to the T. Thanks for any help you may offer! Also, thanks Chad H. For the easy to follow instructions
Do you HAVE to run a new wire to the rear of the truck or can you just use the one under the dash and have a "service trailer brake" message?
Etrailer Expert
Reply from Jon G.

You need to run that 12-gauge wire to the rear of your vehicle.

Reply from Daniel

@JonG I wonder why they would include a blue wire in the bundle under the dash if you couldnt use it?

Etrailer Expert
Reply from Jon G.

@Daniel From my understanding that will work if your pickup doesn't already have the factory-integrated brake controller. If you do have the factory-integrated brake controller then you need to bypass it using 12 gauge wire like the article mentions.

I followed your instructions and it’s still showed Service trailer brake on the screen
Reply from Chad H.

@Terry, did you figure out what had to be done?



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