12 42 500 Replacing the positive battery cable between the starter motor, alternator and positive battery connection point (N54)

WARNING: This page is about a different car, the 2016 BMW Z4, 2015 BMW Z4, and 2014 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Read out the fault memory of the DME control units.
Switch off ignition.
Disconnect BATTERY EARTH LEAD .
Remove INTAKE PLENUM .

Open cover.

Slacken nut (1).

Tightening torque 12 42 3AZ .

Remove positive battery cable lead (2) from positive battery connection point.

Fig 1: Identifying Positive Battery Cable Lead And Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Release nut (1) on starter motor.

Tightening torque 12 42 2AZ .

Disconnect positive battery cable from starter motor.

Release nut (2) on alternator.

Tightening torque 12 42 1AZ .

Feed out positive battery cable from clamp (3) and remove.

Fig 2: Identifying Positive Battery Cable Clamp, Starter Motor And Alternator Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Reassemble the vehicle.
Check stored fault messages.
Delete fault memory.