With no wiring connected, the alternator will simply be an idler to keep the belt tight. Most Leece-Neville alternators can be set up for either positive or negative ground polarity. Is there some overpowering reason to go to a lower capacity charging system? L-N is sort of the Cadillac of alternators.
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!