The traveler wires are run using the other 2-wire cable between the lights and continue on to the traveler terminals on SW2. They don’t connect to the fixtures at all.
In order for a 4 way circuit to work, the 3 way switches must be wired properly at the the beginning and end of the path. So be sure that the common terminal on one of the 3 ways is wired to the hot source, and the common on the second 3 way is wired to the the hot terminal on the lights.
Two-wire cable runs from the switch output to the hot on the light fixture. The source neutral wire is spliced to the neutral on the receptacle half of the combo device and to the white cable wire. At the light it connects to the neutral terminal.
The neutral wire provides a return path for the circuit and the ground wire provides extra protection from electrocution not found on older 30 amp, 240 volt appliance hookups.
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