I parked a 1985 190e-2.3 in a garage and the battery went totally dead. When I went to start with a jump, the alarm system went crazy. Same thing when I tried to hook up a trickle charger without disconnecting the battery. Has anyone dealt with this problem? Any clues about the best road to a fix? None of the doors or the trunk are locked, and that's all the owner's manual has to offer about this.

Corrosion, age or reverse polarity can do this.

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