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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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