Simple transformers (like an ignition coil) would have 4 leads (at least internally) ; 2 for the primary, 2 for the secondary. In a lot of transformers 1 lead of the primary is "common" with 1 lead on the secondary, which are both typically connected to ground, hence the modern 3 terminal coil. So, my current coil has 4 leads, a sparkplug type wire and a screw terminal going to the distributor, and a + and - on the primary side (screw terminal) which go to ground and the start switch, respectively.
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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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