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Diagram Wiring 3 Way Switch. Power at the 3. Mike teaches you how to wire a 3-way switch.
The electricity source is connected to the 3-way switch first. This wire diagram shows the wiring for source power into the first three way switch then 3-wire cable to the next 3 way light switch and then on to the light or light fixtures. It shows the components of the circuit as simplified shapes and the power and signal connections between the devices.
The white wire of the cable going to the switch is attached to the black line in the fixture box using a wire nut.
To get started take a look at the first diagram below. The black hot wire connects to the far right switchs common terminal. Pick the diagram that is most like the scenario you are in and see if you can wire your switch. Red and blue wires link traveler terminals of both switches.