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 - On the Road with Dave Gohl: Auction Musings - by Dave Gohl. I was thinking the other day about all the auctions I've been to in the last few years. There've been many. Some have been very good, some have been well, disappointing to say the least. But no matter how good or bad auctions may be, we always seem to stay until the item we've come for or are interested in is on the block. I've been to some auctions near and far. I think the furthest has been the Two Cylinder 7 in the Amana Colonies last year. Lots of stuff, lots of people. I've also atten
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