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 - The Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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