Motorhome Electrical Systems continued:
In some cases, people without adequate knowledge and understanding can unwittingly connect the ground-side of a load component or device to wood or plastic, rather than metal. (Ask Leeann about being told the clearance lights never worked when she bought her motorhome. When she investigated, she found one of the wires for the lights connected to the wood motorhome body.) Likewise, even connecting to something metal in the motorhome coach (such as the aluminum skin) may not work because that metal may not be connected to the metal used for the vehicle's common ground.
