I've had to replace my battery every 1.5 years or so on my '01. It's been sitting in the garage for the last two years and I replaced the battery about two months ago. I cranked it up today and the battery is dead again. The doors stay closed and the headlights stay off. What could be causing the battry drain? It shouldn't be related to the issue that's kept it in the garage- faulty power steering motor. Suggestions?