You must have an "open station" tractor with the relatively rare 33 Amp alternator.
It is a Bosch alternator, and it would certainly HELP if you had posted the numbers off of the tag!
The regulator for the 33 Amp unit IS shown as NLA, subbing to a new 55 Amp alternator, part # AL81436, @ about $325.00. NOT SEEING where they are coming up with the $500.00.
MOST LIKELY, the brushes, hanging from the back of the regulator are stuck and/or worn out. A local automotive electrical shop should be able to replace just the brushes, or get you a regulator, as needed. (The brushes are soldered in place.)
Or contact these folks, with the alternator numbers in hand. Almost certainly they can help you with parts, and are good to deal with and will quickly send out any ordered parts.
Weitzel's D.C. Electric Norwalk, Ohio Open 8:00-5:00 Monday- Friday Saturday 8:00 to Noon Closed Sundays Ohio 419-668-2844 Toll Free 1-866-840-2844
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