When we had a tractor that developed this problem, (AC D15) we just turned off the ignition with it in gear, let the momentum take it to a stop. In the barn hanging tobacco we would get in place and let the clutch out when we shut it down.
The 140 at one time developed a backfeed thru the alternator, turned it off, the engine would restart. With the key off, 6-8 volts was backfeeding to the coil. unplugging the white connector on the alternator solved this before turning the switch off.
What it would do is cut off, and before the engine stopped turning the current from the alt would fire a spark plug, which would turn the alt, firing more spark plugs. We figured it was getting the 6 volts from somewhere, removing the neg battery cable had no effect, unplugging the alt did.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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