Installing one wire alternator

As I recall GM had alternators with built in regulators for about 30 years from the 80s to 2000s

Well I believe incorrect. My 04 GMC is not one wire, nor was the 95 Olds I sold. They may LOOK like a one wire unit, but you can not tell on the older frames by looking. The thing that makes the older Delcos a "one wire" is the regulator.

This one is not "one wire" but you can not tell by looking. The one on my Farmall looks exactly the same

AlternatorHarness3.jpg

Can you cite some specific models?