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Have the battery charged on a wall charger and then test it to see if it holds. If it holds, the alternator is probably bad but it should also be tested. Have the battery charged on a wall charger and then test it to see if it holds. If it holds, the alternator is probably bad but it should also be tested.
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excessive power loss due to alternator bad..take to parts store so they can check it..diode trio is bad letting power back thru the alternator..basically it wont shut off now and will kill the battery after several hours..
Certainly sounds like a lack of power in the battery. Do you have a genuine BMW battery or a cheapie replacement? Have you tried to jump start the vehicle. Batteries can seem ok, but when called upon, the power drawn out of them can be insufficient. Try charging battery and starting on the charger- or just jump start to see what happens
I would try replacing the battery first. Even a fully charged battery can have bad cells which will cause the battery to not have enough "power" to turn over the starter/engine.
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