I have a 2010 F250 Superduty that when I hook up to my camper, the lights to the camper only works when running lights are on with key off. When I turn the key pass the auxiliary I have no lights on camper at all. I have checked fuses replaced two of them with the same result. Could I have a bad ground? Oh and btw every other truck works with the camper lights. Please help I'm at a loss now! Lol!