4 Way Switch Wiring Diagram - Easy A 4 way switch wiring diagram is the clearest and easiest way to wire that pesky 4 way switch. I have a few of the most common ways in wiring a 4 way switch to help you with your basic home wiring projects. 4-Way Switch Diagram - Ask-The-Electrician 4 Way Switch Wiring 4-Way Switches provide switching from three or more locations. If more than three switches are needed, simply place more 4-way switches between the three way switches. IMPORTANT: As you will see, most 4-way switch wiring is placed between the wiring of two 3-way switches, therefore a 4way switch is installed with two 3way 4 Way Switch Wiring Diagrams - Do-it-yourself-help 4 Way Dimmer Switch Wiring Diagram. This is the wiring for a dimmer in a 4 way circuit. Three-wire cable runs between all the switches and 2-wire cable runs to the light. To make this circuit work, a 3 way dimmer can be used in place of one, or both of the standard 3 way switches.