PSA: I spent 45 minutes chasing a phantom voltage in a crawl space
It was a simple light that wouldn't turn off, and my meter kept reading 12 volts on the neutral. The real issue? My own headlamp was shining on the probe, making the solar-powered meter act up. Anyone ever had a tool fail in a really dumb way?
Hold up, solar powered meter? That's the real problem. Those things are junk for real work. The light from your headlamp was enough to trick the sensor. You need a proper digital meter with a battery, not some gadget that runs on ambient light. I had a similar one fail because a shop light was too bright. Toss that thing in the trash.