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Structure and inner electrical connection

The alternator has a separate terminal for the positive battery lead. The control variables (e.g. nominal voltage of alternator) are transferred to the controller via the serial data interface (BSD or LIN).

The regulator is attached to the back of the alternator.

Fig 1: Alternator - Circuit Diagram
G09871510Courtesy of BMW OF NORTH AMERICA, INC.
Index Explanation
1 Electronic component with controller
PIN REFERENCE

Pin Explanation
BSD/LIN serial data interface (BSD or LIN)
U Positive battery cable