I have an 08 300, small V6. Replaced the alternator and battery, thought I had it figured out, but I'm having the same issue. No mods, car is stock. No lights left on in trunk or glove compartment, phone charger disconnected and lighter USB disconnected, and stereo powered OFF when I leave the car. Car isn't throwing any codes. Car was fine before engine work was done on it, since then, having this issue. Please help!