I'm not sure what you're calling a "fried" starter. I guess I don't even know if you've got a grounded 12 volt starter or a groundless 24 volt starter.
With the "24 volt crank - 12 volt neg - 12 volt pos" systems used on some 4020s - the starter was our number one problem. I was sent to many Deere service schools on the issue. Basically, the 24 volt starters lose their isolation after time, usually from damp brush dust inside. When the develop a ground, the charging system cannot work properly. Usually, all that is needed to fix is to take the starter apart and clean out the dust.
Now, if you have a 12 volt system? There's no electronics to fry - maybe you mean the starter solenoid got stuck engaged? If so, it could overheat, cause starter damage, and drain the batteries dead.
In regard to reverse jumping the batteries? It's not going to hurt the starter, at all. If you did it when the batteries were stone dead - and you have a generator on the tractor, reverse jumping wouldn't have hurt anything - except put a heck of a strain on the old batteries.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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