Before I bought the car 3 yrs ago, it was changed over to an alternator. Now since I've owned it, it has had some modifications ( air ride, retro radio, led lights). Since this I have had battery issues, after about 2 days it's dead. My air ride and radio are hooked up to toggle cut offs. So I be decided to upgrade my alternator to a 105 amp. Is there any thing I need to change or add? Or just replace, plug and go?