There are no resistors in coils. The common (incorrect) thinking is that if some coils have resistors in the circuits leading to them, that those indicating they don"t need an external resistor have one inside. The internal coils are just wound with more and thinner wire to handle higher voltage at the same current levels. If your coil says it does not need and external resistor do not use one. However!! the reason the original wiring diagram has a resistor in it, and the reason it is important is that the ignition bypass circuit (from starter solenoid to the coil side of the resistor) is used to provide cranking voltage to the coil while the engine is being started. This bypass increases the voltage at the "resistor required" coil, putting hot spark to the plugs. If a coil with no resistor required is used, that wire does nothing and the 12volt coil is operating on the 10 volts available when the engine is being cranked. This produces less spark and sometimes no start. Jim
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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