Quinn88
Member
I have a 97 civic with a pioneer deh-p8300ub head unit rockford r-750 amp and mtx thunder 404 amp when I got it all hooked up and my volt meter in I'm only getting 12.6 volts even when reved up any ideas why the battery is only a couple months old and even has grounds up graded to 4 gauge don't have the whole big three done yet gotta get a fuse for alt but can't figure out the drop in volts even when the stereo isn't turned up any idea would be great thanks