I'm running MTX 1501d, the original one, my voltage drops to 10.2-10.5 when the stereo is turned up, and because of that, my amp isn't getting all the juice it wants, Big 3 is done with 4 gauge which did help with massive dimming, but it still dims. At 2000 rpms my alternator is putting out 14.1 80 amps. I'm wanting to switch to a 200 amp alternator but money is tight.