Could be the diodes in the alternator are staying open and bleeding out the battery power.
Have a load test done on the battery as it indicates a bad cell
SOURCE: BMW 318i M46 belt tensioning
The tensioner is spring loaded, and no adjustment is provided, or required.
But if for some, to me, unfathomable reason, the
belt should become loose, causing slippage, I can think of only 3
possible causes:
1. Someone, unknowingly removed and replaced the belt incorrectly, by MISROUTING the belt on the pulleys.
2. Someone, unknowingly replaced the belt with one of the wrong size.
3. One of the belt driven components [water pump, alternator, smog air
pump, power steering pump, air conditioning compressor, etc.] has been
replaced with a new unit which has a different sized pulley than the
one replaced.
4. The tensioning SPRING in the auto tensioning arm has become weak, and if so the arm assembly must be replaced.
As i said earlier, there is no provision for adjustment, as the
tensioner arm assembly is supposed to automatically maintain the proper
tension.
HOPE MY INFO FIX YOUR PROBLEM.
Thanx for using fixya.
Have a nice day.
SOURCE: 1998 BMW 740IL WILL NOT START
This happened to mine.
I took it back to the place where i bought it and at this time i still had warranty on it, they went and looked through it and found that the battery cables were bad.
Hope this helps
SOURCE: battery drains in my 1984 BMW 318i
I have the same car I had the same problem.If you have the correct battery for your car with the same problem you have a short or positive ground in your dash/electric fuel pump/fuse box also be carefull of how you take the key from the ignition and if they're old replace them.
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