I just helped someone to replace an overhead light fixture in an old house
with existing K&T wiring without wire termination ID. I referenced the light
fixture terminal polarities to the nearest K&T ungrounded outlet but
realized if that outlet is wired wrong so will my light installation. I have
a non contact volt sensor but it was not working and also I was tempted to
give the finger test but I'm getting old and my heart may not take the kick.
I guess I should have referenced the polarities to a cold water pipe. What
would you do?