12 42 500 Replacing battery positive lead between starter, alternator and battery positive terminal (N52K)

WARNING: This page is about a different car, the 2011 BMW Z4, 2010 BMW Z4, and 2009 BMW Z4. 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 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 Cable And Nut

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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 Nut On Starter And Alternator

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NOTE: Check stored fault messages.
Now clear the fault memory.