and to be totally contrary: I found the basic 10si alternator with 3 wire hook up will work just fine only using the threaded post. Wire it directly to the battery. When you fire up the car, bring rpms to approximately 2000 and the alternator will self excite. The catch is you'll need to wire in a volt meter to watch your voltage.
I've bought the kit to swap a one wire regulator, new brushes and bearings for less than 10 bucks in the past and done a bunch of them . Either way it works. I was given the newer, smaller GM alternator and made up brackets to attach it to my 370 Pontiac in my 34 ford. Iirc, I used only the big post on that alternator too. My volt gauge says it works just fine and has been for 4 years now.
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