You CANNOT prove that a coil is good by using a multimeter with any degree of certainty.
You CAN, however prove that one is BAD (completely OPEN or badly shorted).
You CANNOT tell if there's a shorted "turn" or two which is what commonly happens, GREATLY reducing coil output and instead dissipating potential spark energy as HEAT.
The ONLY reliable test equipment is some type of coil tester that "rings" the coil, which detects shorted "turns".
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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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