Yea, and those 'most' people don't know what their doing with car audio, let alone electronics. Upgrading the alt wouldn't be needed if adding a second battery using an isolater / relay. Each of those would 'switch' the top off charging to the other battery periodically. One thing that I was informed about a isolator is that it drops 2 volts (lol, not 2 amps), so at 14.4, you're back @ 12.4ish and its barely charging especially if its running your audio system at the same. Relay switch I believe doesn't have that issue. All in all, he's better off with a good cap.