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Placement of Ballast Resistor
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Posted by Thomas Donahy on January 15, 2006 at 07:27:04 from (64.149.37.47):
Dear John T., Bob, KEB, Duane Larson, Bob M., JD Clooney, and others, I need some more enlightenment on why the placement of the resistor before the coil is prefered. It was stated in a previous post that the return path for the secondary is across the plug gap through the block, and through the points and back to the coil.Also, that putting the resistor on the distributor side of the coil would be adding series resistance to the secondary return path. I don't buy this as the points are open while the spark plug is firing. Also, the condensor would act as an open circuit. Consequently, the secondary return path would be blocked from returning through the distributor. It would seem to me that the only return would be from the side electrode of the plug, through the block, battery, key switch, resistor, and coil primary, which is hooked to the secondary inside the coil. Since we are dealing with up to 20,000 secondary volts the addition of one to two ohms of series resistance would be negligible. Perhaps resistor placement somehow affects the primary circuit , but I don't see how. It seems that placement of the resistor after the coil would make it more difficult to bypass during start-up, but that is that is a technical rather than theoretical issue. Please elaborate!
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