Question about Garden
Three way switch diagram: Three-way switch has 3 screws
Before replacing old 3-way switch, mark the wire connected to dark-colored screw
Connect that wire to dark-colored screw on new switch.
If you are confused which wire goes to dark-colored screw
Mark the 2 black wires and the red wire.
You are not going to do anything with the white wire.
Connect blacks and red to any screw, turn on power, and try BOTH switches
Keep trying until correct combination is discovered
Both switches must work in all possible up-down positions before wiring is correct
Incorrect wiring will not blow circuit breaker, the circuit just doesn't work until wires are right.
Four way switch is added to 3-way circuit
Posted on Oct 09, 2010
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Posted on Jan 02, 2017
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