There is a good short somewhere, and i would look at the 12/24 switch first? good chance the contacts have welded together, depending on the switch make you might be able to take it apart for a check and cleaning anyway? a second choice is to install a low amp fuse[s] in place of the 80's , disconnect the main lead at the starter itself,you should read with a volt meter 24v to tractor frame as if starting it normally, without blowing the temporary fuses. I don't have the resistance value of the starter to ground, it will be low, but not zero, if you are getting the 24v and have the resistance, apply the math for amperage, the value might give you the clue.
IT could be possible the starter has shorted across the armature, and could it be that your main lead to the starter has chafed through and is touching the frame? but there should be other signs of sparks and smells if it was. Maybe take a good look and "smell" around the switch/starter area as a clue to whats wrong, that much current should release some of the factory installed smoke ?? :) hope it helps
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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