Testing a residential wall light switch to determine if it has failed internally involves performing continuity and voltage checks using a digital multimeter. First, always ensure safety by shutting off the corresponding circuit breaker at your main service panel and testing with a non-contact voltage tester to confirm zero power. Second, disconnect the wires attached to the switch terminals. Third, set your multimeter to the continuity (ohms) setting, place the test probes across the switch terminals, and toggle the switch handle back and forth. You can troubleshoot switch failures safely. You can verify that your test is successful when the multimeter tone sounds or reads zero ohms in the "On" position and shows infinite resistance in the "Off" position, proving the internal mechanical contacts are healthy.
1 votes
Marked as accepted