Brian, superb link. And it includes one of Maine Sail's "classic" discussions, the one on page 6 or so with Balmar's discussion of acceptance and the higher voltages now being used for dumb or internal regulators.
Here's the Small Engine Mode in action: Alternator Output Management with External Regulators [Small Engine Mode]
Folks might wanna read the embedded links in that topic, too.
Stu Jackson, C34, 1986, M25 engine, Rocna 10 (22#)