Sorry, it was the "lick the wire" part that brought out my sarcasm!
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Yes, I would certainly check for any existing shorts or connections between wires before starting as well. I agree that your suggestion would check the continuity of all five wires, but I took the problem to be much more than that.
How can you use a continuity tester to determine which wire in the basement is the same wire on the roof.
I took this to mean that the problem also entailed identifying the wires at each end.
Isn't this what you meant Erik?
