Posted by Jason S. on November 30, 2013 at 18:11:39 from (174.237.8.67):
In Reply to: Re: points and resistor posted by to30to35mf35 on November 30, 2013 at 15:31:51:
The resistor drops the voltage down for the coil. Not the points. I have ran points on 12 volts with a true 12 volt coil for years and had no problems. The technology to manufacture a true 12 volt coil didn't exist until the 1970's. That's why most all cars and trucks made until the 1970's had a ballast resistor to keep the coils from overheating. GM's first 12 volt coil was the HEI around 1975. Ford did not produce a 12 volt coil until the TFI system in 1985. Even though Ford went to electronic ignition in 1974, the Duraspark system cranked on 12 volts but ran on 9 volts because the coils would over heat on 12 volts.I can't think of any tractors that had true 12 volt coils right off hand.
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