Posted by George Marsh on December 16, 2012 at 05:59:11 from (50.104.246.0):
In Reply to: Ignition Resistors posted by K-Mo on December 16, 2012 at 04:19:16:
Most people are too young to remember how cars were wired when points, coils and ignition resistors were used. My old 1965 Barracuda used ignition resistors. I always carried a spare. Back in the day, if the engine would start and die as soon as you pit the ignition key in the run posistion, it was a bad ignition resistor.
Reason, the ignition switch bypassed the resistor and applied the full 12 volts to the coil. After car started, the ignition switch returned the 12v to the resistor.
So yes, a hotter spark is needed. The 5v you had going to the coil becomes less during cranking, because the battery cranking voltage is less.
Had the same issue with my Jubilee, so I connected the cathode end of a diode to the + of the coil. Connected the anode end of the diode to a wire that I ran to the starter where the +12 goes. My jubilee had no ignition switch like a car, it's only an on off switch, uses a button on the tranny to apply voltage to starter.
When 12v is applied to the starter, slightly less because battery volts drops during cranking, the same voltage minus .6v goes to the coil. Problem solved.
I'm still using the same resistor that applied 5v to the coil. The small resistor you installed may have solved your problem, but it will burn your points faster. So in my opinion, the biggest resistor you can use and it will still work, the better for your points.
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