Wiring A Three Way Switch Diagram. So what you should see if you have correct 3 wire electrical cable romex is a black power white neutral and now a 3rd red wire. Two lengths of four wire with ground cable joined at the fixture box link the right and left switch traveler terminals.
3 way switch wiring diagram. Take a closer look at a 3 way switch wiring diagram. In the ceiling light fixture electrical box one black wire from a 3 way switch gets connected to the black load wire on the light fixture.
In the ceiling light fixture electrical box one black wire from a 3 way switch gets connected to the black load wire on the light fixture.
Pick the diagram that is most like the scenario you are in and see if you can wire your switch. In the above 3 way switch wiring diagram at each switch the black wire gets connected to the copper or black screw. Two lengths of four wire with ground cable joined at the fixture box link the right and left switch traveler terminals. This might seem intimidating but it does not have to be.
