Need help with saturn alternator wiring

[Captain D]

I have a 92 GSX and I installed a modified 130 amp saturn alternator. The battery is not charging (11.5 volts on multimeter). I have the following wiring:

Saturn Pigtail: Red wire
Brown wire
Brown/White wire
Brown/Red wire

Mitsu Harness: Black wire
Black/Yellow wire

I connected the red saturn wire to the battery terminal and the brown saturn wire to the black/yellow wire on the mitsu harness. I also ran 4 gauge wire from the alternator to the fuse block and battery. What am I doing wrong? Does the alternator need to be grounded?

 

[DROPthatCLUTCH]

Now my alt is charging it to 18v blew out my headlight just idling. I can't see it being the voltage regulator as its a brand new alternator... Any ideas guys?