Where is the switch. Check voltage across that.

 

The obvious switch, in the room, did not turn it off or affect it at all. I can't figure out why two hot leads to the receptacle without a switch. I opened to the upstream and downstream receptacles and the red wire was not in either.

So for anyone playing along at home, the top had a black wire and the lower had a red wire. Like might be seen in an alternating wire scheme in a kitchen for instance.

 

Bedroom? No red wire in the switch? Are they the same leg?

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did you check if a red wire went to that switch ?

Sometimes 43 volts means a breaker is tripped and its ghost voltage

 

There is most likely a 3 way switch somewhere.

 

Back in my maintenance man days was changing a ballast. Turned the light on then back off to make sure I was killing power. But then measured like 45v between black and white. Was a 3 way.

Called my friend who is a sparky and he confirmed you’ll get that sometimes


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I've seen ghost voltage sometimes while testing. plug in a lamp and see what happens when testing voltage, flip switch. could be bad switch, too.

 

That is a 3 way switch, you should have 2 switches that control the fixture

 

Did you figure out the issue?

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Made them a retail offer and will be going over in the next few days depending on furnaces breaking and such. I'll let you all know what I find. Some good suggestions that I will pursue.

It appears to have a HO basement remodel so the mystery may be deep and wide!

 

Good luck with that one. Aside from the three way switches that others have noted, I would try to find the source of that red wire. Circuit tracers are awesome for this. Shut it down and see what goes with it. If you have excessive lengths of parallel wires it can be induced, not likely in this case. I found a low voltage issue once where a wire nut was loose. Let us know what you find.