A dropping resistor will pass full voltage when not under load (Points open). This means that the meter is not a substantial load and the resistor effectively passes full volts. If the points are closed, there will be no voltage applied at all. The resistor, measured with an ohm meter, will measure around 2 to 3 ohms. A 12v coil for a resistor system will state (on box or printed on the side) for use with an external resistor. When no resistor is used, a 12v coil will indicate no external resistor required (it is wound with more and finer wire to operate in 14 volts). 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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