3 Way Switch Wiring. A 3 wire nm connects the traveler terminals of the first and second 3 way switch together. Run a black wire from the new switch to the power source.
Connect another black wire from the light to the original switch location. A 3 wire nm connects the traveler terminals of the first and second 3 way switch together. Converting a single pole switch to a 3 way 1.
Traveler wires are interchangeable on each switch.
It s likely you ll also need to replace the. Traveler wires are interchangeable on each switch. Add an electrical box for the second 3 way switch in the basement. When wiring a 3 way switch first screw the terminal screws of the new switch until they are difficult to turn.
