Zach - If the points are not making contact and grounding when closed, the voltage readings you observed are normal.
To verify try running a temporary jumper from the distributor primary terminal to a good ground. Now turn on the ignition and take your voltage readings again. You should see 12 volts on the ign side of the resistor; approx 5 - 7 volts on the coil side of the resistor and the resistor side of coil primary; and 0 volts on the distributor side of the coil primary. (Don't leave the ignition "on" longer than necessary to take voltage readings - to avoid overheating the coil and resistor).
I'd recommend replacing the points/condenser and see what you get.
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Incidentally if your tractor is negative ground, the coil + SHOULD be wired to the resistor and the coil - to the distributor. However the coil will work fine with the connections reversed.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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