The two hot wires of three wire cable connect to a pair of brass colored traveler terminals on each switch.
Three way light switch wiring.
Connect the two remaining traveler wires to the two brass or light colored screws.
The black line wire connects to the common terminal of the first 3 way switch.
Connect the ground wire to the green screw.
Typical 3 way switch wiring nm cable in the 1st diagram below a 2 wire nm cable supplies power from the panel to the first switch box.
Connect the wire marked common to the black or dark colored screw.
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.
In this diagram the incoming hot wire attaches to the first switch s common dark colored terminal.
This 3 way switch wiring diagram shows how to wire the switches and the light when the power is coming to the light switch.
A 3 wire nm connects the traveler terminals of the first and second 3 way switch together.
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.