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the alternator is not putting out amps all the time. Battery light goes on and off. When light is on alternator isn't registering anything on meter. Battery light will usually go off when the rpm's reach 2000

What this sounds like is you have a "bad" new alternator. I'm guessing you bought the reman one cause it was a few bucks cheaper, keep in mind that the reman one went bad once before.  I think if you swap out the alternator with a new one your problem will go away.
 The only other thing is if you have an under drive pulley on the alternator(if you robbed the alternator off your friends hot rod) , this would cause the same issue because it would require a higher rpm to "excite" the alternator and begin charging. 

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