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There were X5s that forded small creeks (not that I suggest that SAV is an off-road vehicle) that you can find the videos of... So, water might not have been a direct contributor to the problem... on the other hand, if water got inside the car, say one of the grommets or plugs was open and water got inside the battery compartment, and then shorted something...
Do you know how to get to the battery compartment? it is under the spare tire in the E53... take a look there
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