There are two types of coil used on conventional tractor systems. a coil with about 1.8 to 2.5 ohms of resistance, and ones that have 3.5 to maybe 4 ohms. The first are called 6 volt, or 12 volt for use with an external resistor. The second group are 12 volt coils. none have internal resistors, they are just coils of wire. The coil you choose is important to avoid burning up the points and coil, or not starting. On the FarmallIH forum there is a greaat article from John T (an electrical engineer) on the facts. It is on the first or second page called 6 and 12 Volt Coils 101 - John T. Jim
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Today's Featured Article - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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