The often-used analogy is that voltage is to water pressure as current is to water flow. The voltmeter is like a pressure gauge on your water system and tells you the potential available to move electrons through the electrical system, just a pressure gauge that indicates the potential to move water through the system.
An ammeter is like a flow meter and indicates the rate electrons are moving through some point in the system, just like a flow meter tells the rate at which water is moving through the system.
Ammeters were once popular, probably because they're simple to interpret. "+" is good, "-" is bad. But they require either running a heavy gauge wire into the dashboard, or installing a remote shunt in the vehicle. Voltmeters are a bit trickier to interpret, since the difference between "good" and "bad" is only a volt or two. When charging systems were producing less that fifty amps, ammeters made sense. But as charging systems became more powerful, the need for current shunts made the voltmeter a better choice, since it only requires a single, light-gauge wire. Also, it's tricky to detect a slight discharge on a 100 amp ammeter, while a discharge state looks the same on a voltmeter regardless of charging system capacity.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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