I had the same problem with my Ford 600 a few years ago. I decided it must by the coil, so I bought a replacement. When I went to install the new coil, the power wire to the coil broke as I was trying to loosen the terminal. It turned out that the braided wire had corroded or frayed inside the insulation. Enough contact was left to start and run the tractor when the wire was cold, but I suspect that the there was enough resistance at the frayed/corroded point to break the contact when the wire heated up.
A new piece of wire solved the problem. An ignition switch (or wire into or out of the switch) could cause the same problem. You might try running a jumper wire from the battery to your coil.
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Today's Featured Article - Some People Like Red - by Art Willis. I was smitten, as a little boy, by red tractors. I used to play in the coastal sand of my Dad & Mom's home with little red tractors, trucks and cars. I grew up believing that like fire trucks, ALL tractors are supposed to be red! Today, the only way I would drive a John Deere is if someone would paint it RED! Driving a Tractor for the first time - About 19 years ago, when my wife Donna and I moved to what was the country then, I was given access to a large Farmall tractor by a wi
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