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. 4-Way Switch Diagram - Ask-The-Electrician This 4 way switch diagram #2 shows the power source starting at the fixture. The white wire of the cable going to the switch is attached to the black line in the fixture box using a wirenut. The white wire becomes the energized switch leg, as indicated by using black or red electrical tape.
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