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 - Preventing Tractor Theft - by Staff. The discussion started with the following message: I have a JD A without key start or any locking device. Is there a best way to secure it so the chances of it being stolen are reduced? Following are some of the answers that were received: Take the rotor out of the distributor and hide after each use. The would-be thieves at least couldn't just get on and drive away.
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