I have a hallway light that doesn't light up with the switch is flipped. My first move was to change the bulb. This did not work. I used a multimeter to test the voltage across that socket and I'm getting 80V. I found this surprising because the other bulb sockets I've tested in the house get the expected 120V.
Any thoughts? Is this something where I need a special bulb or do I have a bigger problem that requires some additional work?
Best Answer
I can't disagree with Paul's response especially when it comes to safety. There are certainly a few things that can be considered here and if you are uncertain I would recommend an electrician because what you describe should never be able to happen and now that is has been identified correcting it is crucial.
Given that you can measure near 120, but it is significantly lower than expected, you almost CERTAINLY have a high resistance connection and this is a recipe for fire. It is possible this is a phantom voltage, but should be treated as live until proven otherwise. Intentionally presume fire is imminent, it could happen at any moment. Now that I got the warning "no kidding this is serious" part out of the way:
Possible likely causes that come to mind:
Steps to resolve: [Notice: when opening or touching wire, secure power, turn it back on when ready to test]
In either case, there is and has been a bad connection in your circuit for possibly a long time. You should check all connections from the light back to the breaker panel. High resistance connections draw more current, thus, more heat. So other connections in the circuit could be, or become, compromised.
Correct any and all bad connections, and replace wiring if sheathing is melted. Contact an electrician if any of this is even remotely questionable.