OK with the coffee, but wait on the humble pie. A web site, cngco dot com, referenced in other posts on this site has a diagram for Farmall 140.
In looking at it I see two things that would lead a person astray.
(1) The battery is shown negative ground, but the coil shows positive post to distributor. With negative ground, coil negative goes to distributor.
(2) The coil to distributor connection is poorly drawn. It shows wire from coil going to side of distributor, but the diagram does not show a feed through at the side of the distributor. The line goes to the circle representing distributor and has a ground symbol also connected to the circle. This would indicate that the coil connects to the grounded distributor case. Diagram needs a feed through indicator
Several other diagrams in that series are incorrect. F 240 gas diagram also has battery-coil polarity mismatched and shows positive coil connection going to a spark plug outlet on the distributor cap.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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