There are many ways that a three way switch can be wired but usually power or the light fixture connect to the load side of the switch and traveler wires run between traveler screws on both switches. Disconnect all three wires or four if the outlet is grounded.

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Three way switch not working. There should be continuity between the. How 3 way and 4 way switch circuits work page. Connect the remaining wire to the in screw. How to troubleshoot an improperly wired 3 way switch step 1. Using a continuity tester check continuity between the common black terminal and each of the traveler terminals. Three way switches work by alternating the power connection between 2 legs called travelers.
Refer again to the figures on the tutorial. 3 install the first. Test a 3 way switch turn off power to the switches at the circuit breaker and using a tester make sure power is off. Each switch powers one or the other leg at all times. Fixing a 3 way switch tips use a voltage tester to help with this job you just need to identify the continuous hot wire and the wire that goes to the light fixture watch the easy videos below be careful working with energized conductors click here to get tims free funny newsletter. 1 turn off the power to the circuit at the main panel.
In this case the traveler wire and load wire were swapped and repairing the circuit involved switching them back. In the latter one of the switches has likely gone bad. In the first 3 way switch box connect the pair of wires leading to the other box to the out pair of screws on the switch. Turn off the power at the circuit breaker remove the 3 wires from each of the switches and make sure that none. 2 turn the power back on. Remove the two 3 way.
In this step you will be turning the power back on do not touch any of the wires previously removed with. Repeat for the other 3 way switch box. There are a pair of wires that run between the two switches. Identifying the common wires. When your three way light isnt working and you have ruled out problems with the bulb outlet cord and plug replacing the three way switch can be done quite inexpensively by any relatively handy. Now using your multimeter you are going to determine which of the three colored wires is.