Reviews of OEM BMW voltage regulator

Could be a bad voltage regulator. They do funky things sometimes.

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.