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 - Maintaining Rubber Tires - by Staff. The broad use of rubber tires on farm tractors and machinery has resulted in a great saving in both time and operating costs since the time of steel wheels. There are, however, certain basic fundamentals in the care of tires that should be followed carefully if the owner is to derive maximum benefit from his or her investment. First and most important is to maintain proper pressure for the work at hand. Your best guide to proper inflation is the operator's manual or instruction book tha
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