Instead of terminals, a 3 way dimmer has 4 wires coming out of the casing: one common, two travelers and one ground wire. The common wire is usually black and the travelers red. In any case, the traveler wires will usually be the same color to distinguish them from the common wire.
There are two sets of terminals on a ground fault circuit interrupter (gfci) receptacle: the line terminals and the load terminals. The source from the circuit should be connected to the line terminals and any standard duplex outlet or other device connected to the load terminals will be protected by this gfci.
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.
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.
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