You will need to go to Mean Green like Mike said or go to a custome electrical motor house and have them re-wire one to meet your needs. It will not be cheap in any case.

If you are going for big sound why not use the dual batteries and a capacitor?

You could custom fab up 2 alternators and make a dual pully for the stock adding in a small v or something like that for the second. It would be cool to see done but I think space will make it more costly than it would be worth.

 

i'm running 2 batteries right now. actually 2 Xs 3100 Group 31. they are good up to 10,000amps. 5,000amps a piece. i just need an alt to keep the batteries charged. capacitor will do almost nothing when you run multiple batteries. don't worry i'm working with some buddies to put in an alt i'll keep you guys posted. and Mean Green.. well i don't know about them but i will try to do this myself.


as far as the stock alt goes i have taken measurements and when i find the right alt i will fab a bracket for it.

questions though.
all i see in the back of my stock alt is 2 wires. A 8 gauge red one, and 16 gauge brown one.
is the alt grounded to the block by its casing?
is the brown wire just a remote to turn on the alternator? (cuz if it is, that'd be sweet)
also what size is the screw that the pulley is on?
what size is the stock belt?
how much play does the tensioner give on a stock belt?(i'm guessing there's a tensioner)

 

Try these people www.alternatorparts.com
I don't know anything about them though.