Trailer Brake Controller Tow Package Wiring Colors are Different on a 2008 Chevy Suburban

Question:

I have a 2008 Suburban, Ive watch different videos. The problem Im having is the wires under the dash are a different color. I have a blue wire, I have a red and black, I have a yellow wire and a green and yellow

asked by: Chris

Expert Reply:

You may not be looking at the correct wire bundle. If it was not held together with a white tag, then it could be something different. Either way you are going to want to test the wiring you have found with a circuit tester like # PTW2993 if you do not already have one.

There will need to be a wire that has 12-volt power and that will attach to the black brake controller wire. You will also need a wire that shows power only when the brake pedal is pressed and not also with the turn signals or headlights on. This wire will connect to the brake controller red wire.

The last 2 wires can be tricky. One will go back to the 7-Way connector for brake out put and the other will be the ground. It is likely that the blue wire you have found is the out put to the trailer brakes. To test this you can use a 12 volt battery to run power down the wire and then have someone test the 7-Way to see if the power reaches the connector. Which ever wire this ends up being it will connect to the brake controller blue wire.

That would make the remaining wire the ground and it will connect to the brake controller white wire. I have included a link that might help you, despite the differences in the wire colors.

expert reply by: Michael H