Trailer Brake Control Wiring Harness
The trailer brake control wiring harness is located
under the instrument panel to the right of the
steering column. The wires are taped to the
harness that goes to the courtesy light under
the instrument panel. The harness will contain
the following wires:
• Red Wire: AUX B+
• Black Wire: Ground
• Light Blue Wire: Brake Signal
• Dark Blue Wire: Trailer Brakes
So, it's not the trailer brake wires (I hooked up a prodigy using the trailer brake wires). I have the same wires/connectors on mine.
I found this...
"...locate the orange, blue, green and black with white stripe blunt wires. The wires can be found straight up from where your left foot normally is."
...from
http://www.rausite.com/hummerh3.htm half-way down the page regarding the installation of the factory offroad light bar. But, the colors don't seem to match up.
Hopefully, somebody will chime in with the answer.