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About the only thing you can determine from an ammeter gauge is when something with a big current draw kicks on, like temperature controlled fans.
What Ron said is correct, but most ammeters are not that accurate.
If you put a voltmeter across the battery terminals, a good battery with a full charge should be about 12.8 volts with the engine off. With the engine running and the alternator working properly, the voltage should be more than 12.8 volts ... something like 13.5 to 14 volts (with all high draw accessories off).
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Warren
'Liberals are maggots upon the life of this planet and need to get off at the next rotation.' (Jamo 2008)
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