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Old 12-11-2012, 09:04 AM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
As stated above, you often get the red battery light way too late (ask me how I know).

But you're in good company as almost everyone has had to replace their battery and/or alternator at least once by now.

These links are for the E39 but they should apply as well to the E38:
- DIY how to test a BMW battery & alternator

If you have to replace the battery, I think you use the same one we do - if so - these should help:
- What batteries to purchase (1) and a simple battery replacement DIY (1)

if it's the alternator, these should help:
- How to test your generator (1) & how to determine exactly what alternator you have (1) & a DIY for replacing the V8 alternator (1) (2) (3) (4) & why rebuilding an alternator is preferable to replacing (1) & cdawg246's quest for materials for a Bosch water cooled alternator rebuild (1)
Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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