How Do You Troubleshoot Electrical Problems In Trailer Lights?
Wired through a connector to corresponding lights on the towing vehicle, trailers lights typically experience problems at this connection point. Connectors vary and can range from four to seven terminals. The typical four terminal connector used on small trailers provides tail, left turn and brake, right turn and brake and a ground return. Larger connectors can add electric brakes, backup lights and 12 volts for accessories. Most wiring problems occur at the connectors or where the wire connects to the light. Other areas to watch are where the wiring flexes, such as on a trailer with a tilting bed. Disconnect the trailer connector and check the continuity between the ground terminal on the vehicle connector and the vehicle chassis using the volt ohm meter. Typically the ground wire is the white wire on the connector and is often connected to a reversed direction terminal on the connector. If there is no continuity, replace the wire between vehicle chassis ground and the connector. Chec
