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i dont agree with the post that says a ballast resistor is supposed to change resistance with temperature. .
You might not agree but you would be wrong. The fact that a BALLAST changes resistance is the entire reason it's called a ballast. Otherwise it would simply be a resistor. MOST resistors used in electronics are intended NOT to change resistance, even though they do somewhat, but they are NOT "BALLAST" resistors.
In the case of Chrysler, this is exactly what they are. Somewhere in the pile of old books around here, I've got documentation to back this up. I am NOT gonna spend time looking for it
According to Wikipedia, a ballast resistor can be fixed or variable . The Mopar variety are probably variable to adjust for the different secondary current needed to fire the plugs under different loads.
http://en.wikipedia.org/wiki/Electrical_ballast
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