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If there were any connections anywhere in the line I would say yes, bad connection, but there are none, it is a 200ft run of solid conductor wire, w/ no connections. 120vAC at the breakers out and 34vAC at the garage end.
If the insulation were damaged and there was a short to ground of any sort the GFI would trip, it does not.
I'm guessing that to replace the 1 wire I'll have to pull all 5(2 hot, 2 white ground and i insulated green ground), then repull through the conduit.
What a PIA, I still don't understand how after 10yrs of service 1 wire car build up so much resistance as to cause such a large voltage drop. I've seen new housing where there is a large voltage drop between the breaker and the outlet but always because of some post installation insult to the wire, a nail or staple or such. In this case there is no way the wire could be physically damaged subsequent to initial installation.
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