When you're troubleshooting a problem and you see something that doesn't make sense, back up and re-check.
First off, are you always checking the voltage at the same point? e.g. from positive to negative battery post? The voltage is NOT the same everywhere in the system; when the batteries are charging there will be a significant voltage drop from the alternator to the batteries and possibly from each battery to ground. Look for voltage drop in the system; a marginal ground connection can cause a lot of aggravation.
If the alternator is "weak" and not charging at capacity, it might have a blown diode. If one phase of the alternator is knocked out it will still charge but at a greatly diminished capacity. Unfortunately, it's not easy to check the diodes without disassembling the alternator; it may even be necessary to desolder some connections.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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