The Power CircuitThe ground circuit is the first thing to check and repair if you have a wiring problem. The power circuit allows the trailer battery to be charged by the tow vehicle alternator when the engine is running. Power Circuit Diagram (click to open in a new window)The above diagram shows a typical wiring circuit that uses a continuous duty solenoid to separate the two batteries when the ignition switch is off. This prevents the truck starting battery from being discharged by the coach electrical needs when you are camping without hookups. There is nothing worse than finishing your camping trip with a dead starting battery! Back to the Trouble Shooter |