Car wiring diagrams: 2 Gang 3 Way Light Switch Wiring Diagram, wiring diagram, wire wiring harness, schematic circuit diagram, wiring diagran, wireing diagram, wirring diagram, wiring daigram, wiring diagrams. 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 wire .Hi All Would appreciate any feedback about the attached diagram. set of lights out of the switch box and only run the three wire from switch .I have explained the difference between a gang switch and a way switch. control, so there must be switch wires or wires that goes to the individual lights..