My charging light started coming on intermittently anf then eventually stayed on, but it would still blink off when I got the revs up past 5,000. I replaced the alt and the light went away. I'm by no means an expert BMW troubleshooter, but this was my experience.

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2003 3.0 5MT Topasblau
Purchased in 2016 and sold in 2024
2012 35d Platingrau