Red-X buddy. What are you going to do with a 24V starting system?
Going to have to give this some thought, but I'm not sure you could pull 24V out of it as you have to put the 2 batteries in a series at some point with one negative post being tied to the other battery's positive post. Pretty sure you'd have to disconnect all the 12V stuff in some manner or you're going to have a great big spark show.
You'd almost be better off adding a seperate 24V system with another pair of batteries, like some small oddesys or something. Probably be less chaotic than what I am envisioning for this to work without burning it to the waterline.

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