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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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