Here two switches are wired in the same box to control two separate lights. The source is at the switch box and a 2-conductor cable is run to each light. One source is spliced to each switch with a pigtail to power the two lights.
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.
A 3-wire cable runs from L1 to L2, 2-wire cable runs from there to the first switch, and 3-wire cable runs between SW1 and SW2. The source hot is spliced to the black wire running between the lights and at the last light, it is spliced to the black wire running through to the common on SW1. The white wire is marked black and spliced to the black wire running to the common on SW2.
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.
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