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GC, I certainly agree, a battery that just setting there if charged up ought to read 12.6 volts (it has 6 cells @ 2.1 volts each) and most alternators will make it rise to 13 and 14 depending on them and the battery. The one wire units may not excite n kick in until a faster RPM but it sounds like you been there. On the 3 wire you can excite n flash them, but Im unsure what you can do on that one wire. I guess the charging circuit from the battery,,,,, ,to and through the ammeter,,,,, ,,to the alternators main stud is all good and low resistance????? and the alternator is well grounded??? Only other thing I would think of is the batterys condition, they can go bad and not accept any charge you know. Insure thefres electrolyte above all the plates and no cells exhibit a gray or milky color, maybe have it load tested. If the circuit from the alternator to the battery is good, I dont see how the alternator could read 28 volts????? (that sounds like a disconnected unloaded reading) cuz its supposedly connected to the battery (via the ammeter) and the battery loads it and to an extent holds its voltage down. CHECK THE WIRES TO THE BATTERY AND THE ALTERNATORS GROUND !!!!! !!! John T
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