I have a 02 tahoe with a factory head unit with a non bone factory amp. I recently changed to a pioneer head unit single din with Bluetooth and ever since i did the my battery keeps goin dead. I've checked wiring, and changed head units also thinking I got a bad radio or i fudged up something. I'm at a loss now. Could it be the onstar or factory anti theft killing it? It only started right after installing the pioneer head unit.