I replaced the alternator on my 2002 3.0 X5 with a new Bosch 140 amp alternator.
With the car on I get 13.7 volts, and when I turn everything you could think on I get 12.5 volts, is that normal?

The other problem is that when I accelerate very fast and the RPM hit 4k or more the battery light comes on for a ¼ of a second, but if I accelerate slow pass the 4k rpm mark it the battery light doesn’t come on.

Any suggestions?

__________________

Every job is a self-portrait of the person who did it.
Autograph your work with excellence.