2003 BMW 730d E65 with Direct Drive
Hoping someone maybe able to help - my E65 recently went haywire - I came out to it after a long journey at night and on starting I smelled burning rubber and the steering started going heavy/light/heavy. Next day the battery died.
I ordered a new battery and fitted it, and took it for a drive. After 10 minutes the car informed me the 'generator' had failed. I took it to a garage who seemed to think that the alternator was dead. I ordered a new alternator, but it still wasn't charging the battery. When they tested the voltage form the back of the alternator it was only kicking out about 11 volts and it should have been about14-15volts. I thought maybe the replacement one may have been faulty so ordered a replacement, but that is behaving in exactly the same way. They also say that if they disconnect the exciter wire to the alternator it suddenly starts running smoothly and not lumpy.
Does anyone have any idea what may be the problem here at all? It's driving us nuts!