4 Wire Switch Diagram. This diagram illustrates wiring for one switch to control 2 or more lights. A 4 way switch is always placed in between two 3 way switches.
They all must be between the two 3 way switches. The source is at sw1 and 2 wire cable runs from there to the fixtures. The wiring diagram further down depicts another choice of wiring method.
The red and white are used as travelers between the 4 way and sw2.
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. 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 wring diagram.
