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.
The common terminals will always be connected to a hot wire, either from the source or on the light fixture. These connections can be reversed if it’s more convenient, as long as one of the 3 way common terminals connects to the hot source and the other one connects to the hot on the load, these circuits will work properly.
Here the source is at SW1 and the light fixture comes immediately after. The source neutral is spliced through to the light fixture. At the light the travelers are splice together and run to the 4-way switch. At the 4-way, the hot wire from the common terminal on SW2 is splice through to the hot on the light fixture.
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.
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