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Try the same but this time shut your engine off and restart a few seconds later to see if it quit charging then.
I don't think it is easy to shut down a spinning alternator because even though you remove the power from the field winding (the electro magnet) the iron "claws" stay magnetised somewhat and it will keep re-exciting itself as it spins within the stator windings and it's iron core.
(This is why if I were to do this,I would probably go the other rout where I would interrupt the alt. output wire (going to the battery+) with a heavy duty solenoid.However then I'm dealing with having to supply power to this solenoid to keep it open or closed etc.)
Also try it with a bunch of electrical load on,at least that will show the voltage difference better when you get it to quit for you.
Barna
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