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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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