ChefJonb

I have a 2020 3500 Denali with the fifth wheel prep that has the 7 pin connector in the bed. Now I did switch out the bed 7/4 pin connector to the pumper and the pumper 7/camera connection to the bed using the 4ft extension cables. Took 35 minutes. It worked great for several trips pulling my camper. Now the truck won’t recognize my camper or any trailer I have. Trailers all test file. Fuses are all good. I get power to camper to run fridge and charge camper battery, I get electric brakes to camper to work, and brake lights only. Nothing else. No hazards, turn, running lights and no camera or trailer connection, no matter the sequence of hook up or start up it does work. Dealer says “ you have a problem. Bring it back next week”. I’m betting it’s a module. But I planned to leave town next week camping. Any ideas? Or any ideas if those modules are hard to get? I’m hoping they don’t say it will take weeks to get parts in. Any thoughts would be welcomed. new-bee to it, jon.