One problem is that my alternator works fine on the bench but not on the boat because of the slow Engine RPM. (When at low low idle I can actually count the belt RPMs as the belt revolves! ) The pulled on the alternator is 2.5" and the engine pulley is 3.5" If I went to a 2" pulley on the alternator and a 5" pulley on the engine would that help? There are 2 belts on the engine. One belt drives the alternator and the other drives the 2 water pumps. If I increase the size of the engine pulley, would it damage the water pumps by making them spin too fast?
Any suggestions on where to find a 2" pulley for the new alternator?
My alternator has 2 feet. Can I use a single footed one like this one from JC Whitney? MARINE ALTERNATOR : JC Whitney: Auto Parts & Accessories
Thanks for your help.