2003 Town country new battery goes dead over night

I've tried putting new batteries in my mini van and the battery goes dead after a day or 2. I've had it to the dealer before and they said it's a bad battery. which clearly it's not. I had a meter between the grounds on the battery and pulled all fuses under the hood and no change. I'm a quadriplegic and it's a nightmare when I go out with my aid to go to a doctors appointment and my van is dead. I don't have any help or money for the dealer again. I don't think the chrysler dealer even looked at it and took advantage of my situation. Does anyone have any ideas? its a 2003 with only 29,000 miles. could it be the alternator drawing power when the car is off?

Well better late than never. You say you had a meter on the grounds. Does that mean you checked for the current draw between the disconnected negative ground cable and the ground post on the battery? Shouldn't see more than 30 milliamps.