I think you've got the whole series vs. parallel thing backwards. It wouldn't even crank with two 6's in parallel. 24 volts will fry every electrical part on a 756. In a series conection, the negative cable of one battery would be hooked to ground, and the positive cable of the first battery would be hooked to the negative terminal of the second battery. The positive cable of the second battery would be hooked to the starter. In a series connection, the voltages of the two batteries adds up, so with two 6's in series you get 12 volts, while the cold cranking amps do not double. In a parallel connection, the positives of the two batteries are connected and the negatives are both grounded. The voltage of the two batteries equlaizes, so the result of two 12's is 12 volts. However, the cold cranking amps doubles. Two 6's in series was factory on the 756. The advange of a series connection is that the reserve capacity of the batteries is greater, meaning you can crank for a longer period of time. With a parallel connection, you get a short burst of high amps. Those old diesels need long periods of steady cranking to build heat, so stick with two 6's in series. Check out your cables, they need to be very heavy. 756's are known for being cold blooded, so plan on plugging it in for a couple hours.
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