After Market Brake Controller Recommendation For 2008 GMC Sierra With Factory Controller

Question:

I have a 2008 GMC 3500 with a factory brake controller. My trailer has Electric over Hydraulic brakes.. what do I need to do to make the factory controller on my truck talk to the Hydraulic trailer brakes?

asked by: Kyle E

Expert Reply:

A factory installed braked controller from GM will unfortunately not work with electric-over-hydraulic brakes on your trailer. You will need to use an after market brake controller and bypass the factory-installed unit.

I recommend the Tekonsha Prodigy P2, part # 90885, or the Tekonsha Prodigy P3, part # 90195 brake controller. These are our most popular because they are easy to install and operate.

I have attached a helpful article that explains how you can bypass the factory unit.

You will need to connect the red wire from the brake controller to the light blue wire with a white stripe in the brake controller wire bundle that is located under the dash. Then, connect the black wire from the brake controller to the red wire with a black stripe. Next, connect the white wire from the brake controller to the white ground wire under the dash.

Last,, a appropriate length of 10 gauge blue wire, # 10-1-1, is needed to go from the blue wire, through the firewall, and back to the trailer connector at the rear of the vehicle. This is ordered by the foot. At the trailer connector, cut the blue brake wire and connect the new wire to the wire from the trailer connector. This bypasses the factory brake controller, but will still allow you to be able to reconnect it in the future if the aftermarket brake controller is removed.