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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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