Might try calling Thor Customer Service. When you do, have your Vin number available. You probably will also need the model. You may have a tag on the wall next to the drivers seat that could have a lot of information about your vehicle. When looking for information here on the forum show as much detail about your motorhome as possible. Until you get a schematic I would follow the wires back to see what they are connected to. The grounds should be fairly easy since they probably go directly to a lug on the frame or engine block. Good luck.