A ballast resistor has very little resistance when it is cool (very little current passing through) so a volt reading will show close to 12 v . Now if the points happen to be closed when you turn on the key then the resistor will get hot, ohms will increase, voltage will drop. Last but not least, some starter solenoids have an extra terminal that is only energized when the starter is engaged. Hook that terminal to the coil side of the resister.
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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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