Can anyone confirm Mercruiser coil specs? (18-5834) I can't seem to locate it. I did read 0.4-0.7 ohm primary, 9-11k secondary resistance, but it was in context for a 5.7 mercruiser (TB V still). The coil I have now is 1.5ohm primary, 9000 secondary. The thing is, I can't find a single aftermarket coil that has such little primary resistance and such high secondary. Typically the aftermarket coils are 0.6 primary and 4500 secondary. Unfortunately, I don't know enough about how these ignition systems work to understand what difference these resistances can cause. For example, the coil I have now is only 1 ohm off of the specified 0.6 primary, but mathematically that is a difference of more than 200%. What role does resistance play in these HEI systems?