I need to put a brake controller on my '06 2500 (4 wheel drive w/5.9
Cummings). Truck came with hitch and wiring on 7 pin plug (conversion
cable drops it to 4 pins for smaller trailers).
Does anyone know how to tell if it's prewired for a brake controller. I
have read thru the service manual but can't find anything that states
the prewired plug is under the dash. I have also looked under the dash,
around the brake pedal, but can't locate any empty plugs.
The actual controller installation looks straight forward, just 4 wires:
ground, 12V power, brake light, and output to trailer brakes.
The connector is wired and there. Mine (an 04 2500 HD) also had a
jumper harness in the glove box from teh factory. Connector is a BLUE
4-pin (in a row, about 1.25" long), to the left of the steering
column, taped (or attached somehow) to the main harness there. Being
on top of a bunch of stuff you have to look carefully for it, but I'm
sure you will find it. I'm 99.9% certain that all trucks with the
towing option (yours, and mine clearly do have it) came with the plug,
and I suspect all (larger) trucks had it regardless...
I can take a picture of the jumper (and the controller I used on it)
if you'd like.
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