The diagrams on this page illustrate connecting multiple lights in 3 way and 4 way switch circuits. Check below for more details about these circuits and some troubleshooting tips.
This diagram illustrates wiring for a 4 way circuit with the electrical source at the light fixture and the switches coming after. Two-wire cable is run from the light to SW1 and 3-wire cable runs between all the switches. The hot source is spliced through to the common terminal on SW2 and the hot terminal on the light fixture is connected to the common on SW1. The travelers run from SW1 to T1 on the 4 way and from T2 to the travelers on SW2. Note that the white wire is wrapped with black electrical tape when it is used for hot in these circuits.
In this updated diagram 3-conductor cable runs between the receptacle and switch, and the red cable wire is used to carry the hot source to the bottom terminal on the switch. The neutral from the source is passed through to the switch box using the white wire and in this diagram the white wire is capped with a wire nut.
In this basic 4 way light circuit the source is at the first switch and the hot connects to the common on that switch. Three-wire cable runs between all the switches and the traveler wires are connected between the two 3-ways and the 4-way. Two-wire cable runs from the last switch to the light fixture and the common on that switch connects to the hot terminal on the light.
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