laura_allen•7d agoProlific Poster

My old voltage tester gave me a false reading on a panel swap job

I was swapping out a 100 amp panel in a house from the 70s last Tuesday, and my trusty old solenoid tester said everything was dead. Went to pull the main lugs and got a real good buzz (scared me half to death, honestly). Turns out the tester was just worn out from bouncing around in my bag for years, and it wasn't making proper contact anymore. I had to run to the supply house for a new digital one, which set me back about 80 bucks, and it pushed the job into overtime. It was a dumb mistake I should have caught by testing on a known live circuit first. Has anyone else had a tool fail on them at the worst possible time? What's your go-to way to double-check your tester is working right before you trust it?

2 comments

2 Comments

bennett.nora7d agoTop Commenter

So your old tester basically decided to retire right when you needed it most? Classic... I always jab the leads into an outlet I know is hot right before I start, just to see the little light freak out. It's saved me from trusting a dead battery more than once.

daniel_wood7d ago

Actually, that test sounds like a pretty bad idea to me. Sticking leads into a live outlet on purpose just adds risk for no real gain. A proper pre-check should be safe, like testing on a known voltage source that's designed for it. Relying on a light "freaking out" isn't a real calibration, it's just a guess. A dead battery can still light up for a second before failing when you need it most. Good habits beat lucky guesses every time.