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

WARNING: This page is about a different car, the 2010 BMW X6, 2009 BMW X6, and 2008 BMW X6. 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 , see 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD .
Remove intake air manifold , see 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (N54) .

Open cover.

Release nut, remove battery positive lead (1) from battery positive terminal.

Tightening torque 12 42 3AZ , see 12 42 ALTERNATOR LEAD .

Fig 1: Identifying Battery Positive Lead

Courtesy of BMW OF NORTH AMERICA, INC.

Release nut and remove battery positive lead (1) from alternator.

Tightening torque 12 42 1AZ , see 12 42 ALTERNATOR LEAD .

Fig 2: Identifying Nut And Battery Positive Lead

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten nut.

Tightening torque 12 42 2AZ , see 12 42 ALTERNATOR LEAD .

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

Fig 3: Identifying Nut And Battery Positive Lead

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Add final details to vehicle.

Check stored fault messages.

Now clear the fault memory.