High output alternator recommendations

Yes, should. When a system is properly operating (and being old, why I like ammeters) when "running down the road" so to say, loads on the system, lights, heater, fans, anything else--should keep the ammeter AT ZERO (centered) IE the battery is charged, "up and normal" and is doing "nothing." No current entering or leaving the battery, so whatever loads are being fed by the alternator

Basically an ammeter IS a "balance" indicator for the battery. You put ONLY the battery (except the starter) on one side of the ammeter, and everything else---all loads and the alternator---on the other side.