3 Way Light Switch Diagram. The ground wire is pigtailed with a wire connector at the switch boxes and the ceiling box. Regardless of what 3 way switch wiring diagram you re following you ll need to use a 3 wire cable to connect the two 3 way light switches.
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. 3 way switch wiring diagram depicting all wires in the ceiling junction box. 3 way switch wire diagram power to light fixture in this diagram power enters the fixture box.
The red wire which is connected to the first switch s.
The black and red wires between sw1 and sw2 are connected to the traveler terminals. Power through switch light is controlled by two three way switches with the light between the switches and the power first going through a switch then to the light and onto the second three way switch. This is the 3 wire cable which you must have to wire a 3 way. 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.
