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Home >> BMW >> 2016 >> X4 M40i >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Engine Electrical System - Repair >> Starter Lead >> 12 42 500 Replacing positive battery cable between starter motor, alternator and positive battery connection point (N20)

12 42 500 Replacing positive battery cable between starter motor, alternator and positive battery connection point (N20)

Necessary preliminary tasks: 

Release screw (1).

Lever out cable clip (2).

Remove cover (3).

Fig 1: Identifying Windscreen Cowl Panel Cover, Cable Clip And Screw
G09943757Courtesy of BMW OF NORTH AMERICA, INC.

Fold back cover (1).

Release nut underneath. Remove positive battery cable from positive battery connection point.

Tightening torque 12 42 3AZ .

Fig 2: Identifying Battery Positive Terminal Cover
G09943581Courtesy of BMW OF NORTH AMERICA, INC.

Unclip positive battery cable (1) from brackets (2) at rear of engine block.

Fig 3: Identifying Positive Battery Cable And Brackets
G09914286Courtesy of BMW OF NORTH AMERICA, INC.

Remove protective cap (1) and release nut underneath.

Tightening torque: 12 42 1AZ .

Release nut (2) on starter.

Tightening torque 12 42 2AZ .

Disconnect positive battery cable (3) from alternator and starter motor. Feed out positive battery cable (3) and remove.

Fig 4: Identifying Starter Motor Positive Battery Cable And Protective Cap
G09914287Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Reassemble the vehicle.
Check stored fault messages.
Delete fault memory.