Something is draining the battery regularly on my sister's '04 ML350. Just put a new battery in it three weeks ago. At another thread, someone gave advice about the sunroof draining into the passenger inside area where the circuit relays are. That this could be the drain cause. Fixed the sunroof drainage so it goes out properly to the wheel well (I assume it's fixed we paid for that to be done). And today the battery is totally dead. Started it a few days ago but today no dice. It did rain like three days ago. Any suggestions of your electrical drainage situation would be appreciated. Thanks in advance.