Mr. Nicholson, I know this is a month old post, but I have been researching one-wire 10SI VRs and it makes me question the heavy 50 mA drain that you quoted. If it was the typical one-wire, there is zero battery connection to its 5 terminals (3 bolted plus the 2 spade connections), so I see no way such VR could ever have a parasitic drain. The typical one-wire unit should have an even smaller drain than the 750 microamps of a real Delco 3- wire! If a drain is measured on such alternator, I suggest there are only 3 possibilities, leakage thru faulty noise suppression capacitor, reverse leakage of rectifier bridge diodes, bad insulation, but not the VR. What say you?
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