This diagram shows the wiring to control a receptacle outlet with two 3 way switches. The source is at SW1 and 3-wire cable runs between all the devices. The hot wire from the source connects to the common terminal on SW1. The common on SW2 is connected to the hot terminal on the receptacle. The traveler wires are spliced in the receptacle box to run to the traveler terminals on each switch. The white cable wire is used as a traveler to SW2 and marked hot with black tape.
The traveler terminals will always be connected from switch to switch. Travelers never connect to a device load or to a source wire. It doesn’t matter which traveler terminal is used for which traveler wire, reversing them should make no difference.
Here a receptacle is added to the circuit before the first switch. It is not controlled with the switches but is instead always hot. The source hot, neutral and ground are spliced to a 2-wire cable that runs to the new outlet. The 3 way switches and light are then wired in the usual way with the common on SW2 spliced to the source hot and the light hot wired to the common on SW1.
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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