Still sounds like your killing the thing with a bad ground loop or something. If your battery is 100% & it's dying after 3 start attempts, you're still pissing up a rope.
1. Take off both battery leads.
2. Check the resistance from the battery ground wire to the starter body / mounting bolt. It should be less than 2-3 ohms (calibrate your DVM first to see what your baseline # is).
Let me know what you get. I'd recommend getting rid of that 1-wire alt. Unless it's a street rod, the extra few wires you'll gain will be worth the low-RPM charge. Once you do this, you'll never look back. The racecar trick sounds cool, but you wind up with just about the same amount of wiring that you'd have with a normal setup.
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