Thanks for the update! Even the 10SI alternators with constant battery voltage to one of the terminals of the rectangular plug draw a tiny amount of parasitic drain, but it is so small that it takes several weeks of inactivity to show a noticeable loss of battery charge. My electrical engineer brother was astonished that GM built their original wiring harness that way, but they were counting on the vehicle being used regularly enough for the parasitic drain not to become an issue. It sounds like the 1-wire setup has a great deal more drain than the way the 10 SI was designed to operate with.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!