Just bought a home built in the 1920's, the knob-and-tube was updated a couple times at different eras but there is still fabric wrapped ungrounded wiring (FWUW) in many rooms. The living room (and crawlspace/storage beneath it) is all FWUW on one circuit, two outlets on the circuit work six outlets (and two lights) don't. They didn't stop working all of a sudden, it was a gradual decline which I hope can help lead to the solution:
- 2 weeks ago the 6 outlets and 2 lights just stopped working one night, the next day I tried the lights again and they came on for about 1 minute and then died again
- The next day I measured the voltage on several of the outlets and they read ~1v across hot-neutral
- The next day, investigating further, I measured them again and now they read ~60v across hot-neutral
- A couple days later I plugged in a light into one of the outlets (forgetting they were dead) and the light worked for about 5 minutes and then died.
- Now all dead outlets read ~1v.
- The two working outlets read ~125v and have continuity across hot-neutral, the dead outlets read ~1v and have no continuity across hot-neutral.
Its an old house with lathe and plaster so its difficult to trace wires but I can't find an obvious junction box to investigate for bad connections, there are no GFCIs on the circuit and none of the outlets I found have pigtails w/bad connections.
Is there a particular issue I should be looking for and what technique(s) can I use to track it down? Looking around here and elsewhere it could be a loose wire (haven't found one yet), a GFCI (none on the circuit) or a faulty 'shared neutral'?