I have a 2002 Sub, awhile back my battery would go dead over night, which went on for weeks. I replaced the 3 year old one but the problem persisted, I had to leave a charger on over night. I put a meter from the disconnected ground to the ground wire, I pulled every fuse and relay I could find to no avail. Oddly enough a week or so later I forgot to hook up the charger, much to my surprise the problem had gone away. That was mid summer, just a few days ago it returned! I did quite a few net searches and found it seems to be an issue several others have or are experiencing, I only found one possible solution that was to re flash the computer. Looking for any other ideas before going to the dealer, I am tight on $$ having recently gotten off chemo and not back to work.