Re: Ammeter vs Voltmeter
If you keep the alternator with polarity change, you have to reverse the direction of the wire going into the ammeter loop. These old Ford ammeters are safe as they use an induction principle so will not short out if an overcurrent condition is met.
If you want a voltmeter to measure the battery, hook the wires directly to the battery for the most accurate measurement. Otherwise run the negative to a convenient ground and the positive to a convenient switched power source.
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