I'm working on finalizing the plans for my electrical system now, and I have decided to go with 6 6volt battaries, each 600 CCA, for 2 sets of 3 in series. This will give me 18volts (it will be running slightly under so the 18.0V max rule in Super Street should not be broken). Now I want to keep the car in super street, so I cannot have more than 2 alternators total. Originally, I had planned to have the stock alternator, to run the car's 12v system, and two extra alternators on their own circuits running at 18v. However, something needs to change in my planning to acomadate the 2 alternator rule. Is there any way I can run my stock electrical off one of the 18 volt battary banks, without blowing things such as the ECU etc? Any suggestions?
Thanks,
Mike

Oh btw, system is 4 Visonik V900XD amps, 2 pairs strapped into 1 ohm load, and 2 Beyond Audio Inhuman 18s. The Visoniks product considerably more power at 17-18volts.