Just as a troubleshooting approach, I would put an ignition timing light on any of the spark plug wires and watch its behavior as the engine stalls. If it's evident that the spark is vanishing just before the engine RPM drop, then check all the wiring and switches again. If spark is still present after the RPM start to drop, it's >probably< not an ignition problem.
You said the wiring had been "looked at," but that won't necessarily turn up a problem. Every now and then a wire will corrode and/or break inside the insulation and out of sight. The slightest bit of flexing (like a tractor trying to move) can allow the wire to shift position ever so slightly -- and fail. Then, at rest, the wire can return to its previous position and conduct just barely well enough to fool you. The same thing can happen inside a switch due to wear, dirt, moisture, oil, etc.
Anyway, if the spark is vanishing, I would follow janicholson's recommendation regarding the test light (this is different than a timing light), and temporarily bypass any suspect wires and switches using known good parts just to make sure there are no hidden problems.
It's a long shot, granted, but this situation disabled my daughter's truck this year and it was a bugger to figure out!
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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