Pretty simple. The coil is one of two different designs (they look the same but differ in the amount of wire in the windings. A coil that is intended to be used with no ballast resistor is made to operate with 12v directly and have an Ohm reading from one little terminal to the other of about 3 to 4 Ohms. A coil that is intended to use a ballast resistor (in series with the coil input from the ignition switch) operates on about 6 volts and has a resistance of 1.2 to 1.5 ohms. The use of an alternator on the tractor is a determining factor as to which way the battery is connected. Almost all alternators are negative ground and the battery is connected that way, negative terminal to ground. If equipped with a generator it could be either positive ground (as it was likely from the factory) or negative ground. If it is charging now, then the polarity of the battery is correct for the way it currently is. Answer: The ignition circuit supplies the coil with voltage, the coil conducts this voltage to the points. The points and condenser in the distributor are a switch that makes and breaks the flow of electricity. (Kettering Ignition Systems for your perusal) the coil should be attached to match the battery polarity such that the small terminal on the coil attached to the distributor matches the battery Negative ground is negative coil terminal to distributor. The voltage going to the distributor will only show up if the points are open. Your engine almost always stops with the points closed, as such if you test with a light it will not show voltage on the side connected to the distributor unless the points are open. Jim
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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