The 'S" terminal is only energized during cranking. I doubt if that would be appropriate, unless all the alternator needs is a momemtary signal to start the regulator working. If you've got a stomp starter, there won't be an S terminal anyway!
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!