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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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