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Ballast resistor & resistance wire, aftermarket ignitions
I knew that the ballast resistor is supposed to be removed from the hot
lead to the coil when an aftermarket electronic ignition system is
installed. When I put my Jacob's system in, there wasn't any ballast
resistor so I assumed a po had taken it out.
Snooping through the 800 shop manual I found IH used a resistance wire
instead of the ballast resistor. The book says 72" wire length for 1.8
ohms. So I ran a new wire from the ignition switch over to the Jacob's
bypassing the voltage dropping wire and giving the full battery voltage to
the ignition.
This was a two hour job. A few miles of test driving last night and it
seemed like I had more power. I wonder if I'm just imagining the
performance increase. Has anyone else done this and noticed any
improvement? I assume the ignition output is proportional to the voltage
input, if so, I'm getting a hotter spark.
Doug, who likes to believe every change is an improvement.
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