4 Way Switch Schematic Diagram January 3, 2019 4. 4-way switch configurations are used to control lights with three or more switches. www.electrical101.com 12 Pin Wiring DiagramElectrical Wiring 3 Way Light SwitchLincoln 225 Welder Wiring DiagramLight Circuit Wiring3 Prong Vs 4 Prong2 Dimmer Switches One LightWiring Wire Colors4 Wire Pressure Transducer Wiring Diagram