Wiring a 3-way light switch system correctly requires following a precise terminal connection layout between the two switches and the light fixture. First, always isolate power by shutting off the circuit breaker and verifying zero energy with a voltage tester. Second, identify the common terminal (usually labeled and colored differently, often dark brass) on each 3-way switch; connect the incoming power line to the common terminal of the first switch, and connect the wire leading to the light fixture to the common terminal of the second switch. Third, connect the two traveler wires (typically black and red) between the remaining two brass traveler terminals on both switches. You can troubleshoot wiring safety easily. You can verify that your corrective action is successful when restoring power and toggling both switches independently turns the light on and off smoothly from either location.
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