Regrettably--since I think that's hurting my batteries--I upgraded to a 100 amp alternator on one side. It has a single pulley (and doesn't eat belts), but I had to upgrade that "50 amp" breaker at the engine--it tripped out on me the first time I ran the boat.
When that alternator goes away, I will replace it with a stock unit.
Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell