Removing the alternator

Remove cover (1) .
Loosen nut (2) .
Disconnect positive battery cable from alternator.
Unlock plug connection (3) and disconnect.

Courtesy of BMW OF NORTH AMERICA, INC.
Loosen screws (1) .
Thread out holder (2) and set aside.
Guide out alternator (3) and remove.

Courtesy of BMW OF NORTH AMERICA, INC.