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Re: Resistor placement
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Posted by Gerald J. on May 07, 2007 at 07:38:04 from (67.0.103.21):
In Reply to: Re: Resistor placement posted by Dale B on May 06, 2007 at 20:45:28:
The points always have one side grounded. Makes it inconvenient to wire the resistor there. The resistor has no effect on the coil voltage when the points close because an inductor takes zero current at the instant the points close. The current rises (exponentially) according to the L/R ratio and the resistor limits the peak current. The use of the resistor also allows a more rapid rise in current good for high speed engines because the low voltage coil will have lower inductance giving a better L/R ratio with the external resistor for very high speed engines. I suppose the resistor could be wired between the coil and the distributor too, but never is though if a coil has an internal resistor is switched in polarity it might. If the resistor was between the coil and the points it could confuse someone trouble shooting the ignition system expecting the points terminal to go to ground with the points closed and might effect an electronic tachometer connected there also. I've not tried putting the resistor there, my gas 4020 uses the resistor shorting by a special contact on the starter solenoid for better starting. Originally that resistor was hidden in the ignition switch and sometimes in iron wires that look like copper wires. Gerald J.
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