I purchased a Hifonics 1606D for my car its a 97 Ford Escort. has a stock alternator and battery basically. I want to know if i can just upgrade to get a yellow top for just the sub and amp then later on upgrade the alternator. Also how much will these voltage drops harm my battery, sub, and amp? Anyway i can try and avoid it for now so i can save up to buy a new alternator and all that?