My Bosch alter failed at 135k miles on my e46. Well, the Voltage regulator is what failed. No weird noises coming from it so my bearings are fine. The rotor looked great as well so I only replaced the VR. I had been using my Bluetooth adapter to monitor things saw it producing just 12 volts. The eventually it only produced 11.5, and then 11.00.

After seeing that cn90 and old skewel having rebuilt their OE parts, I will be going that way for all alts in the future.

It was a bad month for me with alts with both the 545i and the 330xi failing on me in the same month.

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2004 E60 545i Sport 6MT. Black/Black Build Date 6-2004 102k miles