12 42 530 Removing and installing/replacing battery positive lead (between starter motor and alternator) (M54)

Necessary preliminary tasks:

Read out fault memory of DME control unit.
Switch off ignition.
Disconnect negative battery lead.
Observe instructions for Disconnecting And Connecting Battery .
Remove suction filter housing. See INTAKE SILENCER .

Release nut and disconnect battery positive lead (2) from alternator.

Tightening torque, see 12 31 1AZ and 12 12 1AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .

Fig 1: Disconnecting Battery Positive Lead From Alternator

Courtesy of BMW OF NORTH AMERICA, INC.

Unscrew nut (1).

Tightening torque, see 12 41 4AZ and 12 12 1AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .

Detach battery positive lead (2) from starter motor and remove.

NOTE: For a better overview, this work step is shown from below. Carry out removal of battery positive lead from above.

Fig 2: Removing Battery Positive Lead From Starter Motor

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Interrogate fault memory of DME control unit.

Check stored fault messages.

Rectify faults.

Then clear fault memory.