with the car in acc it reads 12.8,my friend told me to do the same thing and it went up like u said.i just read about the big 3,u think if i upgrade this it would help? cuz all this stuff is stock.
hu: pioneer deh-p600ub
amp:2 brutus2600(1700@2ohm)
subs:2kicker cvx's2ohm
wire:4g kicker
car...