A typical old tractor coil would have in the range of 1.25 to 4 ohms (use ohm meter on Rx1 scale) primary winding resistance as measured between its little + and -terminals, while something like 5K to 10K ohms (use meter on Rx100 or Rx1000 scales) in its HV Secondary IF EITHER SHOWS AN OPEN CIRCUIT THE COIL IS BADDDDDDDDDDDDD
HOWEVER even if it passes BOTH those ohm meter tests (which it MUST or its bad) that dont tell you if its GOOD cuz she can break down once warmed up and especially at high voltages (HV insulation breakdown) which the low voltage ohm meter test simply cant show you.
A realllllllllll coil tester, however, can test for higher voltage breakdown and thats often where a coil fails anyway especialy after its warmed up
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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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