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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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