Old house. Some wiring is knob-and-tube. All connections to circuit box is Romex. Here is what I can't figure out. I'd like advice on what it might be and how to fix it.
I shut off the breaker to Circuit 8. Voltage tester tests off. Plug in a light, it won't light at any outlet. HOWEVER, if I take a non-contact voltage tester (chirper) and hold it right up to light switch, whether switched on or off, it tests for current right next to the box. Additionally, I get a positive for current next to an uncapped neutral on the same circuit. If I shut off Circuit 18, which in no way looks to be tied to Circuit 8, then I get no current on 8.
Also, in another part of house, ceiling lights constantly burn out.
Thanks for any help and ideas.