The circuit which powers the ceiling lights in my garage has unexpectedly gone dark. I installed the electrical and it has worked for over 20 years. I am in need of suggestions on how to troubleshoot the problem. I have checked continuity to the first point of load and it seems to be OK. Any suggestions.
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Assuming you have
1-continuity from the panel to the first load point for the hot, neutral, and ground wires
2-No shorts (breaker isn't tripping)
You have a bad breaker.
Check for 120v on the load side of the breaker.
If the breaker is tripping, start opening boxes and look for something wrong. loose wire nut or kinked wire are the probable suspects. isolate sections of the circuit and find the short.
Very helpful. Thanks so much--never thought of a bad breaker!
You have provided insufficient information. However, start with the circuit breaker box. Check the voltage at the output to that circuit at the breaker output. It could be a bad breaker?
If it is in the garage you should be able to trace the cable from the breaker to the first load point or switch. Check the voltage there. Also check the neutral wire for a loos connection or splice. A loose splice can go open with time. Corrosion can get in and cause an open circuit. Don't trust your eyes! Make sure it is tight.
Check the switch. Make sure it is in the on position. Then check for proper voltage on both sides of the switch.
Last, or maybe first. Check for voltage across the socket. If you measure proper power there it is a bad socket or bulb.
I hope this helps
Your humble servant
Marvin F. Malm PE(ret)