Originally Posted by Diesel
Theoretically it should not matter nor harm the alternator. The alternator only sees one large battery when the relay is energized. As a result it will have to run longer to bring the system up to a full charge. Any amp alternator will work but a higher amp alternator will charge the system faster, thus work less.
Is there any difference between a marine rated alt.. (or does such a thing exist..) and your basic high amp Ohio Generator or.. stinger alt? Since these are standard GM blocks you should be able to bolt up just about any alternator your heart desires, assuming you can use a car one. But I'd imagine there would need to be some sort of spark arrestor or SOMETHING..