dootsie: What is the serial number of your 140? If it is truly a 65 model,it will be 12 volt from the factory. 140 changed to 12 volt at serial number 26801, which happened in mid 1964.
I've never had a one wire alternator on one of these older Farmalls, always went with 3 wire. From my part in discussion here over the past ten years, and I read a lot more than I type. I would have to say one wire alternators on these 30+ year old tractors, don't eliminate problems, just changes them. I have 3 tractors on 3 wire systems, I'm satisfied it works without problems.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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1965 International Harvester McCormick Farmall cub tractor 2,500. Two owner tractor. My grandfather bought new in 1966, then we inherited it. Have all the paperwork original manual and all maintenance records. It starts and moves. Comes with underbelly mower, plough, and some other attachments.
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