12 42 500 Replacing positive battery cable between starter motor, alternator and positive battery connection point (N55)

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Necessary preliminary work

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

Fold back cover (1).

Release nut underneath. Remove positive battery cable (2) from positive battery connection point.

Tightening torque: 12 42 3AZ .

Fig 1: Identifying Positive Battery Cable And Cover

G09875447

Courtesy of BMW OF NORTH AMERICA, INC.

Remove protective cap (2) and release nut underneath.

Tightening torque: 12 42 1AZ .

Disconnect positive battery cable from alternator.

Fig 2: Identifying Connector And Protective Cap

G09875448

Courtesy of BMW OF NORTH AMERICA, INC.

Unclip positive battery cable (1) from holder (2).

Fig 3: Identifying Positive Battery Cable And Holder

G09875449

Courtesy of BMW OF NORTH AMERICA, INC.

Release nut (2) on starter motor only .

Tightening torque, 12 42 2AZ .

Remove positive battery cable from starter motor and pull out.

Fig 4: Identifying Connector, Nuts, Screws And Starter Motor

G09875450

Courtesy of BMW OF NORTH AMERICA, INC.

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