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

WARNING: This page is about a different car, the 2005 BMW 530i, 2005 BMW 525i, 2004 BMW 530i, and 2004 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.

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.