Could be a bad voltage regulator. They do funky things sometimes.
Pros: easy to replace
Vehicle:
BMW
Reviews of OEM BMW voltage regulator
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6 votes
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2 reviews
Description
OEM BMW
Germany
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Just an FYI for you and whomever might come across this post. Bmw alternators are amazing and have removable voltage regulators. Just had a voltage drain that I diagnosed as a bad alternator on my e61. New voltage regulator for $30 and I’m back on the road, this was about 4 months ago. Saved me a lot of money when I was considering a chain store alternator, and it’s all oem equipment now. After this I learned that most of the time it’s not the alternator that goes bad, just the regulator. But almost no one makes alternators with removable regulators anymore.
Pros: saved money, OEM equipment
Cons: voltage drain
Vehicle:
BMW
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What we know about OEM BMW voltage regulator
The brand is registered in Germany.
In March 2026, PartReview does not yet have a formed opinion of OEM BMW voltage regulator. You can help by adding a review for OEM BMW voltage regulator.
Currently there are 2 reviews and 6 votes. Average rating — 4.5 out of 5. Vote balance: 6 up, 0 down.
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- Electrical behavior - no surges or weak power to accessories during trips - rated positively. 4 points out of 5.
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