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Jim, the reason in the past why two six volt batteries were used in series on 12 volt hard to crank applications, was simply cuz the series combination, having more lead n acid n plates, stored more energy. While given the same design, technology, and construction, the combination of two batteries has more lead and acid and plates and, therefore, stores more energy. HOWEVER two light duty small wimpy 6 volters in series probably WOULD NOT store more energy than a single high rated heavy duty 12 volt battery. Likewise, two sixes manufactured 30 years ago may not store as much energy as a more modern super heavy duty 12 volt of today. To answer your question, if space for battery mounting isnt an issue or problem and she cranks hard, two heavy duty 6 volters in series is probably your best bet. However, if room for battery location is limited to where you can only use a single battery, then you better use the highest rated 12 volt battery you can find. ALSO, if cold weather starting is necessary and shes difficult to crank and you wanna go with just a sinle 12 volt battery, you may wanna consider the more expensive but higher rated modern gel cell batterys !!!!! ! The series combination, while it doubles total energy stored over just one, doubles voltage BUT NOT either batterys amperage capacity. If you want twice the amps at the same volts, then you go with the parallel combination. NOTE all the above discussion is for a 12 volt system, either the single 12 or series sixes, but on some diesels they went with 24 volt starters you know, but the total max energy stored talk would still be correct, whether it be four six volt batterys or two 12 volt units. Good Luck n God Bless John T
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