13.8v idling on 2 190a alts? regardless of battery bank, if at idle, so realistically probably 70a-100a per alt, drawing 900-1000a (if you are really getting power out of it), there is no way you are holding "13.8v full tilt sitting still."
I have 2 270a alts, and 6 group 31's, 1 group 34 (4 XS power @ 3 deka's), and with 2 5k boards @ .5 each, i can get it down to 12.9v without even clipping the amplifiers.