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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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