I'm installing a Tekonsha Primus IQ on my 2017 Coachman 2150LE MBS.
It has the FR installed 7 pin trailer plug in the rear. Under the driver's seat I found 2 wires capped with inline splices. See pic. One is solid orange marked BRAKE CTRL. The other is heavier guage, unmarked, and blue with a white tracer.
Before I go ringing out the wires, does anyone know where they go?
I'm guessing the one marked BRAKE CTRL is the "stop light" feed that the controller looks for to know when you've applied the brakes and perhaps the heavy blue wire feeds the brake power output pin in the trailer connector.
PS
I didn't see a green 4 wire plug typical of a Mercedes prep for a brake controller.