4 Way Switch Wiring Diagram - Easy 4 way switch wiring diagram for free to help make 4 way switch wiring easy. 4 Way Switch Wiring Diagram. 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.3 Way Switch Wiring Diagram · 4 Way Switch Wiring 4 Way Switch Wiring Diagrams - Do-it-yourself-help 4 Way Switch Wiring with Four Switches. Here two 4 way and two 3 way switches are used to control lights from four different locations. The two 4-ways are located between the two 3-ways and the traveler wires run from SW1 to T1 on the first 4-way. T2 from that switch is wired to T1 on the second 4way and T2 connects to the travelers on SW2.