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Using A Circuit Tester To Test A Switch

- Disable power to the switch at your breaker box.
- Hold the tester by the insulated areas only.
- Hold one probe against the bare copper grounding wire. Then one at a time, touch the other probe against each of the terminal screws. If the bulb on the end of the circuit tester lights up at any point, the circuit is still live and needs to be disabled.
- Disable the circuit at your breaker box and try testing it again.

Using a Circuit Tester to Test a Switch