hi my brother is puttin in some beat in my pops 1968 cougar with a stock alternator. he has new JVC KD-HDR60 deck 2 mtx 6x9s an 2 mtx 5x7s an in the trunk, two 12''s mtx jack hammers an i think about 1200w? amp his power cable is a 2g would it be smart to put in a cap my pops dont want the...