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Hi my name is Robert...
Sounds like you are going to need a wiring diagram of that circuit, normally they will tie the parking brake in with the wiring at the brake, I would check the wiring at the parking brake and make sure nothing has come off or is loose, it could be a loose connection. Hard to say where it is exactly tied in, I would call Coachmen and see if they are willing to give up a print for you, I do not have one or I would give it to you. They can be reached at 866...425....4369, I would ask for technical support, most all RV manufacturers have a tech. department and sometimes they will give prints out. I would think the connection point would be at the front end near the parking brake inside.... Hope this helps some... Robert