Tow Package Wiring Colors and Functions for a 2007 GMC Sierra 1500 New Body Style

Question:

the wires i have on my 2007 gmc 1500 new body style have differant colors and the tag on the wires under the dash do not say anything about the electric brake system there are also more them 4 wires i do beleave these are the right wires i just want to be sure they are, do you have the exzact color hookup for these wires i have 6 wires in the harness.

asked by: Chris J

Expert Reply:

the wire bundle you are looking for looks like the one in the FAQ article I have linked for you. It is located under the left side of the instrument panel to the left of the steering column. The wiring colors should be as follows:

Red/black wire = 12 volt power
White = ground
Light blue/white = input from brake switch
Dark blue = output to trailer brakes
Orange = not used

There also may be some connections that you will need to make under the hood to make everything fully functional. This information is also in the FAQ I have linked.

expert reply by: Michael H