I recently had my alternator and battery replaced for the first time in 6 years. I have a 1100W Amp powering a 12 in sub. I have a capacitor rated at 5 farads. The problem i am having is that my amp will shut off while im driving and turn back on randomly. I noticed on the capacitor the volt meter would read like 7.3 volts which is too low. (Should be around 13.8 to 14 with the system low) Is a new alternator have anything to do with that? Anyone know what I should check?