3 Way Switches Wiring Diagram With 2 Wire. I have detailed quite extensively why a two wire control system can be problematic in the article 2 way switch with 2 wire control. Use black and red wires to connect traveler or brass colored terminals of the first switch and the second switch.
All the issues raised there apply here too especially if used in stairways and the switches are on different floors. All earth wires should connect to the earth terminal in the switch back box and if you are using metal. Wiring 2 3 way switches.
This 3 way switch wiring diagram shows how to wire the switches and the light when the power is coming to the light switch.
Pick the diagram that is most like the scenario you are in and see if you can wire your switch. In this wiring diagram the fixture is connected to the switches with three wire cables. Since power one hot and one neutral is at both ends the hot at one end is connected to the common while capping off the unused neutral and at the other end the neutral from the power feed is connected to the lights neutral while capping off the unused hot. 3 way switch wiring diagram line to light fixture.