Hello everyone. I'm sort of new to these forums but here we go. I've been having problems with my stereo and battery. It all started when I installed an aftermarket radio into my 2000 Catera. I've had the wiring checked so many times by different radio shops and that all tell me that the wiring is correct. I've noticed that the OnStar lights on the buttons remain on so I had OnStar removed and it worked for only 5 days then once again my battery died. It only dies if I leave it off for more than 12 hours. So I had my battery and alternator checked the alternator was bad so I replaced it. But it only was a temp solution. After 12 hours of leaving it off the battery died. I don't know much about cars, so I don't know what do to. Please Help!