95 Deville with the 4.9 I'm guessing? I have a 98 Deville with the 4.6 Northstar and my alternator is under my car
Did you remove the trunk carpet and the fuse rack behind the rearseat? You should experience a noticeable amount of bass gain if you take the carpet out and cut the fuse rack in half and move it to the side. You can also remove the piece of leather behind the rearseat armrest to let the bass though. I even went ahead and got rid of m 6x9s and made fiberglass pods on the B-pillar for the rear passengers.