hi,had similar problem,bought alternator off ebay,it has low rpm exciter in it,think it means the built in regulator,which is in the alternator kicks in at a lower rpm and that allows the system to start charging,so far so good,battery is staying charged amp meter shows that it is charging,before i bought new alternator I would have to rev engine real high before the amp meter would show that it is charging,sometimes would have to ride tractor around and rev engine before it would start charging with old alternator,not anymore,start tractor up and immediately starts charging,I think I bought it from triode diode or something close to that on ebay,happy,happy,happy now,took that from Phil on duck dynasty,good luck.
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