[GreenSnakeDoc]

Ammeters are good at indicating when a battery cannot accept a good charge. For example, if the battery is "down" and you need a jump to get the engine started, you watch the amperage when driving or fast idling. It should take many minutes at a high charge rate to fully charge a battery if the battery is good. If the ammeter shows the charging amps getting lower fairly quickly, the battery can't take a good charge and should be replaced. Sorry I can't be more specific on times and charging amps, but it's been many years since I was a college student on a tight budget. Is "ammeter" the correct spelling, or should there be a "p" in there?