Trailer disconnected message on F150

Those 2 wires look same as mine, 2019 Coleman 17RD, may be for the solar charging. At the front passenger side of the trailer, there's a square receptacle with a lid about 3 feet above floor level, open it and there's a round plug inside. That's where the exterior solar wires are supposed to go. The white and blue get hooked to the battery. Why Coleman did that is beyond me, just hook the solar up through the controller and then to the battery. Simple test, use an ohm meter on the blue wire to the receptacle I spoke of.