Structure and inner electrical connection: Notes

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: Electronic Component With Controller - Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.

Index	Explanation
1	Electronic component with controller

CONNECTOR PIN REFERENCE

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