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

Courtesy of BMW OF NORTH AMERICA, INC.

PART SPECIFICATION

Index	Explanation
1	Electronic component with controller

Pin assignments

CONNECTOR PIN REFERENCE

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