When i bought my car (87 na) it had battery problems from the jump. I knew that i planned on installing a powerful sound system so i put a brand new battery got a new alternator and put a 2.4 farad capacitor in it. when i start the car the battery needle idles at about 8 volts i have to rev the engine in order to get it up to around 14. Ive even taken the battery out and charged it to full potential last week to make sure that wasnt the problem. as im listening to my radio my needle is bouncing back and forth. with a 2.4 farad cap installed! has anyone else had this problem? what are some of your ideas on a solution?