I just had the alternator and belts replaced. Drove it for a couple days and tonight, I got on the gas a little extra a couple of times, lol, and the light came back at high rpms but went off at idle.
I checked via the OBC and at idle it is charging at 14.0, when I rev it over 4k the light comes on and the voltage drops down into the low 12's. go back to idle and the voltage climbs back to 14.0.
So it seems backwards to me. Maybe a loose belt? I don't know. Any thoughts would be appreciated....
I have searched, and most of the threads I find are about the opposite... Light on at low rpm and goes off when you give it some gas. That is how mine started, until it totally died. That is why I got the alternator replaced to begin with.
Again, any thoughts would be appreciated...thanks
05 ///M3 with 35k miles