On second thought, it looks like this probably would not be adaptable for a 13.5V system. You would have to run 18.5V to compensate for the voltage drop, and would need 10-15A diodes to get enough current through. I still have plans for it, though. A wire shunt instead of diodes would work, though.
To find out spark energy, an inductance reading would be required, but the coils' built-in circuitry defies taking accurate readings. Perhaps reading from the positive lead to the secondary lead might lend a clue, but I can't be too sure about it.
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