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Old 02-06-2013, 09:37 AM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
Posts: 21,283
Mein Auto: 02 BMW 525i M54 auto 130K
In addition to what QSilver7 said, I'd suggest you drive to Autozone or O'Reillys (or whatever you have where you live) and have them check the charging system.

I went to both, just in case, just this week for this thread:
> Detailed step by step diagnostic DIY ... dead battery ... parasitic current drain

Their test takes only about five minutes, in toto ... so it's easier than doing it yourself.

However, to do it yourself, as QSilver7 noted, you'll need to measure stuff:
- DIY how to test a BMW E39 battery & alternator

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Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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