This wiring shows the light fixture and the electrical source between the switches. Three-wire cable runs throughout and the hot source is splice to the common on SW1. The common on SW2 is spliced through to the hot on the light fixture. The travelers from SW1 are spliced at the fixture outlet box to run to the 4 way switch.
This drawing shows the wiring for multiple lights in a 4 way circuit with the source and fixtures coming before the switches. More lights can be added to this circuit by duplicating the wiring shown here for each additional fixture. Here 3-wire cable runs between L1 and L2, 2-wire cable runs from the last fixture to SW1, and 3-wires runs between SW1 and SW2.
If your switches stop working they may be worn out or the screws may have come loose. If you’ve wired a new switch correctly and the circuit still doesn’t work, the switch may be defective. Check that all connections are tight. Check the switch, remove it from the circuit and test for failure with a continuity tester or multimeter set on the Ohms setting.
Included is a diagram for a 3 way dimmer and an arrangement to control a receptacle from two locations. For more information about these circuits and troubleshooting tips check below.
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