I suspect the radio/cd player wireing connections!
In my ford truck the battery would drain dead every two weeks if I did not drive it. I started removing the faceplate of the pioneer cd/radio player and the vehicle will start right up after sitting for 5 or 6 weeks. Seems that the radio was draining the battery.
I only use the truck to go to the dump or hardware/lawn and garden store. Good luck.
1982 240D 313,000 (4 speed)
1984 300CD 172,483
1985 German Shepherd Dog -Lacey- R.I.P.11/04/05
Hood Stars, Wrist Crowns and Obsession Dobs