2003 BMW 528i SULEV
The battery light has been on since I bought the car a month ago. I tested the Alternator and Battery and they are fine. I've driven it 400 miles and one trip was 70 miles over two hours. Battery light on the whole time.
The only time the battery light isn't on is if it's been sitting a few hours and I start it. Then, after the engine warms up I can hear the engine change sounds and the battery light comes on.
I have looked everywhere and no one has discussed why the battery light comes on when there isn't an issue with charging.
I would assume the alternator is bad. As it warms up that light will come on. Lot of guys. Don't know how to properly test alternators and they can actually drive quite. Sometimes the alternator is starting to wear out. I had a customer with one he went years. With that light going on it's still ran
