AC Outlet voltage diagnosis
An exterior outlet on my recently purchased house was non-functional. It had supposedly been repaired prior to sale, and there is a new GFCI outlet and a new outdoor outlet cover. But the outlet still didn't actually work.
I took it apart today, and found that the hot and neutral were connected to the load, instead of to the line side of the GFCI. I switched it, and now the outlet works.
In the process of fixing this, I measured the line voltages and found
Hot-Neutral: 117V AC
Hot-Ground: 47V AC
Neutral-Ground: 46V AC
What's the diagnosis?
My guess is that the ground wire, is uh, well, not really grounded. Nearby, the outlet on the interior wall has roughly the same voltages. I've found at least two different circuits with suspicious voltages, as well as several circuits with normal voltages. (This is a 1920's house, luckily all the wiring is modern, but I have not yet mapped out all the circuits)