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I have just purchased a boat with a Universal 5432 engine with Motorola 55 amp alternator. In doing a full check of the electrics I have found that the voltage at the alternator at 1400rpm is 13.46 volts.
Is that ok? The previous owner said he had had trouble with batteries in the past. Does anyone know if I can fit a larger capacity alternator? Thanks for any suggestions.
 

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That's low. Normal output is 14.3-14.4 VDC from any alternator running at "cruising" speeds. If there's an integral regulator, it might need replacing.
 
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