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What year and model Ford are you talking about with no marker lights?
Do you have parking lights?Is this a Class A or Class C RV?
I am going to have to OPT OUT and reopen your question to the RV experts. The 2005 Coachman Aura is a Class A motorcoach and the only thing Ford is the chassis and the drivertrain. I have no knowledge or wiring diagrams for this motorcoach.