12 42 500 Replacing battery positive lead between starter, alternator and battery positive terminal (N54)

Necessary preliminary tasks 

• Read out fault memory of DME control unit
• Switch off ignition
• Disconnect BATTERY NEGATIVE LEAD
• Remove INTAKE AIR MANIFOLD

Open cover.

Slacken nut (1).

Tightening torque 12 42 3AZ .

Remove battery positive lead (2) from battery positive terminal.

Fig 1: Identifying Battery Positive Lead And Nuts

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Release nut (1) on starter.

Tightening torque 12 42 2AZ .

Disconnect battery positive lead from starter.

Release nut (2) on alternator.

Tightening torque 12 42 1AZ .

Release battery positive lead from retainer (3), feed out and remove.

Fig 2: Identifying Retainer And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.