Can't tell much from your pictures, but the two 12 volt batteries should be hooked up in parallel, ground to negative, negative to negative, positive to positive to switch. As to the no start, if it's cranking over fast enough, you either have air in the lines or the stop solenoid is engaged. You didn't say which engine you have, and cats and cummins bleed differently. Most Cats have a bleeder pump on the side other engine, most cummins will self bleed by turning the key on and of several times. But if there is air between the pump and the injectors, you might have to bleed them. If you have never done it, and are not mechanically inclined, you will probably need a mechanic to do it.