It had an alternator on it when I got to it.  My reason for the alternator is that it will charge much faster because it's a show tractor and doesn't run for extended periods of time.

I know about the minimum rpm to make it charge and i know I'm reaching that because I get a good charge signal when it's working.  My pulley is only like 2.5 inches.

Basically, you're saying that I just need to put a switch on it so that I can turn it on and off when i want it to charge.

I also read about my particular alternator that it doesn't discharge when it's not running.  The internals completely shut down unless the pulley is spinning.