When starting, the battery voltage is dragged to 10.8 to 11.5 volts with a good battery. In cold temps, this can be 10 volts, and it also assumes good sized battery cables. When the resistor is in use on a 12v resistor required coil, or a 6V coil, the lowered voltage is reduced to the point that spark is compromised. Thus a resistor bypass puts puts at least 10 volts into a 6v coil making great spark when needed most. When the key is turned to run, the coil is again given its rated voltage. When a 12 no resistor needed coil is used this advantage is just not there. It is commonly used on automobiles and has a history of being a standard method of increasing starting reliability. Jim
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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