On a 12 volt tractor YES you can EITHER use a full true 12 volt coil (NO Ballast required) or else a 6 volt coil with a voltage reducing (12 to 6) external series Ballast Resistor. A full true 12 volt coil dont require any ballast on a 12 volt system and has a priamry resistance in the neighborhood of 2.5 to 3.5 or so ohms. Theres nothing else required in the ignition priamry system wiring if its a 12 volt coil on a 12 volt system.
Yous sure the voltage reducing ballast resistor was wired correct in series with the coil after the switch and ahead of the coil??? If it were a good ballast (ohms around 1.5 to 2) and was wired correct it should have reduced the current and voltage on a 6 volt coil so it will work and not burn 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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