That piece you are reffering to is a ballast resistor. It cuts the voltage down going to the coil so it doesn't over heat. Most 12 volt conversions have that because they do not have a true 12 volt coil installed. If your tractor was converted with a GM 1 wire alternator and most of them are, the voltage regulator is contained in the back of the alternator itself. I have seen them short internally and drain the batteries. Get the alternator checked and if it isn't there then it is a wiring issue or a switch that has gone bad internally. Your meter going crazy is normal if the tractor has non resistor spark plugs installed and the meter is digital. Does your tractor have an amp gauge? Does it show discharge while the tractor is sitting still and not running?
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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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