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 - 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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