Hook the curled end of the wire under the screw then tighten down the screw to hold the wire firmly in place.
Three way light switch wiring.
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.
Connect the wire marked common to the black or dark colored screw.
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.
A 3 wire nm connects the traveler terminals of the first and second 3 way switch together.
This 3 way switch wiring diagram shows how to wire the switches and the light when the power is coming to the light switch.
Connect the two remaining traveler wires to the two brass or light colored screws.
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.
The two hot wires of three wire cable connect to a pair of brass colored traveler terminals on each switch.
In this diagram the incoming hot wire attaches to the first switch s common dark colored terminal.