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with the alternator running at around 2200 rpm (for most alternators this is topout meaning it is producing as much power as the rectifier will allow) an ammeter connected to the main power out of the alternator in between the battery and alternator should show you how many amps your alternator is putting out

remember that most newer alternators require a 12vdc signal to "excite"the stator this is usually supplied by a separate positive wire in the pigtail of the alternator

The only current that will be read is the actual current that is being drawn from the alternator at the time of the test. If the battery is down in charge, it will show a high current draw. If the battery charge is satisfied, the current level will only be that of what other circuits are drawing current in the car. The current output is totally dependent on the load on the alternator. The only true way to test the actual current output of the alternator would be to have it load tested at an auto electric store. They run the alternator on a jig and do a load test.

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