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According to everything ive read you can get 12 volt from the batteries on a 5ton and the truck comes from the factory wired to utilize it for the low speed heater fan. I know the 12volts dont come from the alternator and there is no 24 to 12 volt convertor that leaves pulling 12 volts from the...

To clarify you CAN do Parallel and Series at the same time but you need at least 4 batteries. This is how a 4 battery setup works in our trucks (correct me if im wrong please), 2 of each in parallel to make 12volts at double the capacity then you connect those two pairs in series to get 24 volts.

What you are doing is running the same two batteries in both a series and parallel setup at the same time. From what I have read that is not possible. http://www.batterystuff.com/kb/articles/battery-articles/battery-bank-tutorial.html

He could also use a battery equalizer, though they tend be alot more expensive.