A 4 way switch must be wired between two 3 ways as shown in the diagrams on this page. A 4 way has five connections: one ground, and 4 circuit terminals divided into two matching pairs. Each pair of terminals should be wired to the traveler wires from one of the 3 way switches. The travelers can be wired to either terminal in a pair, but don’t mix up the pairs or the circuit won’t work properly.
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.
With this configuration any wire in the circuit may be hot at all times and there’s no protection against electrocution. When replacing an ungrounded device in an older circuit like this, use the polarized one above and not the grounded receptacle at the top unless it is grounded to a metal outlet box that is itself grounded to the house electrical system through a continuos metal conduit.
At the lights the hot source is spliced to the black wire at each fixture box, at the last fixture it is spliced to the black wire running to the common on SW1. The neutral from the source is connected to each light fixture with a pigtail and run on to the next light.
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