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 - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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