I would love to help but I don't have any diagrams of your motorhome if that's what you're thinking. If the lights aren't working right, you need to check and trace wires, no two ways around it. In short, use a circuit tester and check for power at the trailer pin. If there's no power on said pin, find what wire controls it and start tracing it back until you find the break. I don't have any wire color guides as they can vary from vehicle to vehicle I have attached a general article below... view full answer...