Fix issue with 2 independent lights on single source
Oh my, I understand your frustration. I've recently moved from an 1856 + 1880 post and beam "building" house.  I have not found any nobb and tube, but plenty of tar-paper covered 2 wire, and a ton of BX, all probably 14 &amp; 16 g.  There are new pulls of 14-2-G to junction boxes with the old wires, back to two 100A breaker boxes, installed in the 70's. Everything I've done is 14-2-G, 12-2-G or 14-3-G clear back to the breakers. The breaker boxes were "upstairs/downstairs" but I couldn't keep that. I feel your pain.  You will probably need to (add to your tool box) get a circut identifyer for AC.  IDK what they cost, but know I saw one the last time I was at Lowe's.  I did find junction boxes burried below floor level from a remodel in the 1940's. They hacked a lot of things that time.  This building had between 2 &amp; 6 remodles per room.  Yes, it was a blast!  Getting the AC tracer will help you "find your way".  I bought a Cat 3/4/5/6 set for pulling &amp; finding network cable.  That is the best way I can think of, if cutting a LOT of holes is not your plan.  Good Luck.  JLH