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post #5 of Old 01-04-2011
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Does anyone else have a concern with putting a 105 amp alternator on a 20hp engine? Assuming the batteries get rundown and the alternator is trying to put out big amperage while one is trying to motor someplace, I would think it would be very easy to overload the powerplant. I upgraded from the factory original Hitachi 35 amp alternator when it died to "only" a 65 amp on my QM15 and wouldn't want anything bigger. Maine Sail and others can probably provide some data on the parasitic drag in HP of larger amperage alternators when under full load.
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