Glad that changing over to a smaller water pump pulley has helped with the cooling! With a 109* ambient temp running at 210* is doing pretty good!
But, about that alternator. If you didn't change the size of the crank pulley or the alternator pulley, you didn't change the alternator speed. It doesn't matter what the size of the other driven pulleys are or how many other driven pulleys are in the system, the speed is determined by the driving pulley and the pulley being driven. So, all that matters for the alternator speed is the size of the crank pulley and the size of the alternator pulley.
