W211 E55 battery/fuses?

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Joined
May 20, 2019
Messages
17
Location
London
Car
E55

Hi all, hoping someone has a suggestion.


The battery on my W211 E55 is dead again- no worries, I have a spare. Swapped over - there were some sparks which is unusual- (the polarity is correct)- and as soon as I connected the negative the alarm (positive connected first) went off with a constant tone, opened the door manually and put key in, dash is dead.

Had to disconnect it as it’s so loud. Has anyone experienced this and has a solution? Has it blown a fuse or fried something? Many thanks all.
 

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