Alternator and Batteries - SailNet Community

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Old 06-25-2006   #1
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Post Alternator and Batteries

I just put new batteries in the boat. They read around 12.7 When I turn on the engine and take readings, they are around 14.5 Is this increase significant?

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Old 06-26-2006   #2
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Normal!

12.7VDC is aprox a fully charged battery. The 14.5VDC is the alternator charging the battery. Don't have time to educate you on battery electro-chemistry in this post but you could read "Nigel Calder" on boat systems or read one of the boat electrical books by "Spa Creek Press".

Try this link for a quick and free intro to batteries: http://autorepair.about.com/cs/elect...a121000b_2.htm
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Old 06-27-2006   #3
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Yes, it's a good indication that you're Alternator is working.
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