4. Testing Light Fixtures
When checking light fixture wiring, take down the light and using a “tick-tracer”, test the circuit to see if it working. This tester lights when you place it close to a wire that has current flowing through it.
To double-check the circuit, first turn off the power to that circuit. Now, remove the wire nuts from both the black “hot” wires and the white “neutral” wires. Separate these sets of wires so that they are not touching one another.
Turn the circuit back on and check between the black and white wires with the voltmeter or neon tester. Be careful not to touch the exposed wires. The voltmeter should show a reading of around 120 volts. Likewise, the neon tester should light if the circuit is working properly.