don't know what you are trying to pull but some horse trailers are wired different than rv's. Is this truck new to you or did it just stop working? Is this a factory installed brake controller?
My brain won't engage right now but something tells me there is a dummy fuse in there that has to be replaced. Also on our 2500 HD the plug cover on the bumper gives you the wiring diagram.
I had to put a fuse in the box under the hood and connect wires that are taped to the steering column (or is it the ones between the fuse box and the fender?) to get the aux power to work.
Will try and dry out the brain and come back later with more info.
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