I don't like the idea of not having 14 volts for the ignition. what about running two systems? Run the ignition with the alternator, using a motorcycle battery, and a larger pulley on the alternator. run the rest of the car with a deep cycle battery. even if you completely drained the deep cycle battery the car would continue to run. the larger pulley on the motorcycle ,just running the ignition system, would take less fuel to run than the alternator with a regular pulley.
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