In this arrangement the source for the circuit is at the light fixture. 3-wire cable runs from the switches on each side, to the light. The hot source is spliced to the common terminal on SW2 and the hot terminal on the light fixture connects to the common terminal on SW1. The traveler wires are spliced at the fixture box and run to the traveler terminals on both switches.
Depending on the manufacturer, the travelers may be on opposite sides of the device or the two terminals may be on the same side. In any case, the common terminal will be distinguished from the travelers in some way.
When replacing an ungrounded, polarized receptacle use this type and not the grounded type above, unless it is grounded by a jumper wire to a metal outlet box that is tied to the house service panel ground through a continuos metal conduit.
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.
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