I suspect that in wiring up the one alternator, the original power feed wire has been by passed. The original ammeter works off of very low power, (it senses the voltage drop caused by the wire resistance in the short distance from one side of the radiator to the other). If the one wire off of the alternator goes directly to the battery then the charge reading for the gauge has been eliminated. There is a way to hook up the ammeter but it would be helpful to know what was done and the size of the wire used.
Jim
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