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I'm trying to figure out how to load the pictures I have showing he wires that you need. I too was so frustrated with Freightliner and Jayco dealers because none of them would help me work on this myself. They all wanted to sell me something. The freightliner dealer tried to tell me that they would have to reprogram the truck computer, so I decided to trace all these out myself. The wires are located underneath the dash and behind the steering wheel column and brake pedal. They are really tucked back up in there and are hard to find. Mine were wrapped up in a wire loom that had to be cut open to find them. The wire loom comes up the left kick panel through the floor of the truck. Here are the wires and the colors for what each does.
RED- 12v power from truck batteries. Mine already was wired with a fuse and breaker on top of the battery.
WHITE- Ground. goes all the back to the RV plug and ground on the chassis
RED/WHITE STRIPE - Brake signal wire
2- BLUE - Trailer brake signal. There are two of these but they are wired together back by the RV plug