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 - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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