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Why did vehicles go from 6 volts to 12 in the 1950s? Because you can get more current through the starter, meaning the starter turns over faster. Back then, battery manufacture was all manual labor, each cell in a lead-sulfuric acid battery generates about 2 volts. So 12 volt batteries were...

It is no different than house wiring, only instead of the middle being ground, the negative of the 12 volt side is ground. You have TWO 12 volt systems, combined you have 24 volts. You CAN run 12 volt loads off the rear battery, you have to use the 12 volt side for the negative. Meaning BOTH...