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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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