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Frank is about got it. But, you can get an inductive pick up ammeter and lay it across the battery cable (doesn't matter which one). You should read an output about equal to specification with the engine at about 2 grand.
What Frank talks about is a load tester, in which you load the system through a carbon pile, holding the revs to about 2,000. The load should be increased until the voltage is 12, and at that point the amperage should match specifications. Many shops have these load testers, but I have to say that in many years of teaching auto electrics for a major manufacturer, I never once met a tech who used the machine the way it was designed to be used. In the case of our bikes, the lights would have to be turned off while this test is being run.
But Frank is correct that voltage is meaningless information; it's amperage that counts.
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Paul
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