Make sure the breaker supplying the. Flip the switch toggle one way and then the other.
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How to test a 3 way switch. The meter should display 1 ohm or less meaning the switch is on. Put one lead on the box or ground wires and the other lead on one of the gold screws. This story features diagrams that show how to wire 3 way switches. We are going to test the other two screws. You can only test the switch safely when there is no electrical power present. Check the bulb to make sure it is not burned out.
Once youre done youll be able to control a light from two switches. Wiring a 3 way light switch is certainly more. To test a 3 way switch connect one meter probe to the common terminal and the other to one of the travelers. You should have power on this screw when the switch is in one position and not have power when the switch is in the other position. Put the switch into the on position. Testing a three way light switch check the bulb and the breaker.
Testing the switch in circuit with a continuity tester will show the connected loads. Connect the red lead to one of the terminals on the switch. Using a continuity tester check continuity between the common black terminal and each of the traveler terminals. The wiring is more complicated than a traditional single pole switch but well explain how to make the connections. Test a 3 way switch turn off power to the switches at the circuit breaker and using a tester make sure power is off. These are the runners of the circuit.
Connect these wires to the switch 1 wire on each of the brass colored screws. To test it without removing from the circuit the voltage function would be needed with the power on then you would look for 120 across the contacts when the switch is in the off position or in the case of a 3 way the hot will swap from one side to the other. Remove the two 3 way. You are at the power side of the three way switch. The third wire is the common wire that feeds the light fixture and is connected to the black screw on the switch. Use a continuity tester or multimeter on the ohms setting to determine if its conducting electricity properly.
Turn off the breaker. Connect the black lead to the other terminal on the switch. Touch the probes to the 3 wires removed from the switch until you get a reading on the tester indicating continuity. There should be continuity between the.
Gallery of How To Test A 3 Way Switch
