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That is not enough voltage to turn the engine over. Batteries should be at about 13.4 volts. My guess is that you alternator is bad, and the truck was running on the batteries. I would try to jump it and see if you can get it started. If so and the truck runs when you disconnect the jumper cables then watch the volt meter in your dash. If is starts dropping continiuously then you have a bad alternator.
99.5 F-250 4x4, 7.3 PS
State 1 injectors from Rosewood, GT38 (van) turbo, S&B intake, Comp Cam's 910 valve springs, Smith Brothers pushrods, AIH delete TS 6-position chip. Pyro.
2005 front end conversion, 2008 tailgate, taillights, and rear bumper.
Edge CTS monitor, and 4" Exhaust (Manufacturer to be determined).