Wiring a 3 Way Dimmer Switch - Ask-The-Electrician Wiring a Standard 3-Way Dimmer Switch. 3-Way Dimmer Switches typically come with the following pre-wired leads. Green wire: Attach to the bonded ground wire(s) in the switch box. Two Red wires: These wires attach to the "travelers" which are the pair of wires attached to the two screws at one end of the regular 3-way-switch. Lutron 3 Way Dimmer Wiring Diagram | Free Wiring Diagram Collection of lutron 3 way dimmer wiring diagram. A wiring diagram is a simplified conventional pictorial representation of an electrical circuit. It reveals the elements of the circuit as simplified forms, and the power and also signal connections in between the tools. 3 Way Switch Wiring Diagrams - Do-it-yourself-help Wiring Diagram 3 Way Switch with Light at the End. In this diagram, the electrical source is at the first switch and the light is located at the end of the circuit. Three-wire cable runs between the switches and 2-wire cable runs to the light. The black and red wires between 3 Way Switch Wiring Diagram - Easy Take a closer look at a 3 way switch wiring diagram. Pick the diagram that is most like the scenario you are in and see if you can wire your switch! This might seem intimidating, but it does not have to be. With these diagrams below it will take the guess work out of wiring. Interested in 3-Way Dimmer Installation Assistant - Lutron Electronics 3-way Dimer installation assistant tool. Quantum Vue. Lutron’s NEW facility management tool empowers you to manage your building from anywhere.