Light Switch How To Wiring Guide And Diagram Light Switch How To Wiring Guide. Related Links 3 Way Light Switch Light Fixture Wiring Outlet Wiring. The single pole light switch is the most common, one light switch controlling one or more light fixtures. A 3-way light switch is where you can control one or more lights with two switches (common scenario at the top and bottom of stairs). Light Switch Wiring Diagrams - Do-it-yourself-help Multiple Light Wiring Diagram. This diagram illustrates wiring for one switch to control 2 or more lights. The source is at SW1 and 2-wire cable runs from there to the fixtures. The hot and neutral terminals on each fixture are spliced with a pigtail to the circuit wires which then continue on to the next light.