Ammeter to Voltmeter...who does it?

BTW. This probably one reason why charging systems got ammeters. A voltmeter can not reveal if current is flowing to the battery. It will show if the alternator is not working (voltage will be battery voltage 12ish) or can't keep up with demand (between 12 and 14). But when showing 14 volts, we can only assume the battery is charging properly.