Yes, it matters significantly where the traveler wires are connected on a 3-way light switch, though interchanging the two traveler wires with each other is generally acceptable. Every standard 3-way switch features one dark common terminal and two light brass traveler terminals. The two traveler wires running between the two switch boxes must always be connected to the two traveler terminals, while the incoming power line or outgoing fixture wire must connect to the unique common terminal. You can troubleshoot terminal connections safely by isolating power first. You can verify that your corrective action is successful when attaching travelers to the correct brass screws ensures proper multi-location circuit continuity and smooth switching operation.
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