electrical nightmare need help
 

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I have a 2008 ram 2500 6.7, fully deleted, 4" back exhaust with mini maxx. I recently changed the water pump, a few steering components and exhaust manifold gaskets. when I started the truck my volts dropped to 12 and the check guages light came on along with the lightning bolt. the batteries died after a few hours of driving. I replaced both batteries and the alternator. cranked the truck, same problem but added a check engine light. all the sudden I'm throwing 30 codes and now I sit here with 2 brand new dead batteries. anyone have any idea what the he'll is going on.