When I plug the trailer my 2016 Puma sits on up to my 2018 F-150, the Ford dash tells me the right trailer blinker is not functioning. Mine has the 3 function lights (running, brake and blinker), the other 2 functions work correctly. I replaced the light unit, but still doesn't work. If it were a fuse in the truck, I assume neither the left or right would work, and the left works correctly. Does anyone know what the color of the wire in the trailer that would cause this issue, or any other thing I can try?