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.
Thanks, Si
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