Charging current is a function of load. If his battery bank is fully charged, the resistance will be high, the current draw low. His volt meter does drop to the battery voltage. I'd probably slap a carbon pile load tester on the alternator before I pronounce it a failure. Of course I have load tester because I play with this stuff, but a ten foot coiled 12 gauge or larger steel wire in a five gallon bucket of water will give a good test load as well. Basically a multimeter is a little light to determine his problem.
On the wind spinners, 20' above the trees works a lot better than 20' below.
mike
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I tried to contain myself, but I escaped.
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