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according to what ive read, the ballast should bring the voltage do 5.5-6 volts in 'Run', mine is 5.6 in run, so thats fine. The problem is when cranking, it should be 12 volts and its only 7.7.

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If it will run with 5.6 then it should start with 7.7 even tho the speed is slower/less firing impulses (with 2.1 higher coil input pri voltage) and we will never get 12 (or batt voltage which will very likely be higher than 12 maybe 13+) cuz there is one heck of a voltage drop in the system cuz of the starter cranking draw. I'm still trying to think of something that will help you (& when I get to my racing partners truck I may need to fall back on this