3 Prong Trailer Connector June 17, 2019 Trailer Light Connector 3. Trailer Light Connector, 3-Prong. www.tractorpartsasap.com Typical 3 Way Switch Wiring3 Way Wall SwitchRj11 Connector Wiring DiagramSymbols For Wiring DiagramsIs Copper Wire A Conductor12 Volt Wire Lighting Systems24v Relay SwitchLed Well Lights 120v