Those alternators if let set for a time will lose their excitation and need to be excited again. It is an easy thing to do. My 30 with the same alternator does the same thing when it sets over the Winter with out running. I will check tomorrow on the procedure how to excite the alternator again, it is just a matter of jumping one terminal to another on the alternator, but the information is out in the shop. Call me at 419-343-3678 Roger
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