Car wiring diagrams: 1 Light 2 Switches Wiring Diagram, wiring diagram, wire wiring harness, schematic circuit diagram, wiring diagran, wireing diagram, wirring diagram, wiring daigram, wiring diagrams. Once you re done, you ll be able to control a light from two switches. To add the switch, you ll use one of two wiring diagrams, depending on whether the power comes to your light switch first the cable Three way switches .Three way switches control lights and receptacles from two points for a new switch and existing fixture, add another feet for the two connections, diagram Option . Fixture Controlled by Two Switches Power Through a Switch Box.This video shows the circuit of operating turning on and off one bulb independently with two switches. .