Bill, you have a dead cell in your battery if it is reading 10.57 volts. Your battery charger will give you a fully charged reading, which only means that cells that will take a charge are charged up. Very strange that you got this reading on both batteries. A normal battery should show around 12.5 volts fully charged. Before I even messed with the starter or its wiring, I would make sure I have a good battery showing 12.5 volts. For what it is worth, as your probably know, you really only need to be running one battery in your 911.
Kurt V
72 911E
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