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Home >> BMW >> 2012 >> 320i Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Engine Electrical System - Repair - F30 >> Starter Lead >> 12 42 500 Replacing the positive battery cable between the starter motor, alternator and positive battery connection point (N20, N26)

12 42 500 Replacing the positive battery cable between the starter motor, alternator and positive battery connection point (N20, N26)

Necessary preliminary tasks: 

Vehicles up to 07/2014: 

Pull off rubber mount (1) and slightly raise service cover (2) until lock of cover (3) is accessible.

Unlock lock and remove cover (3).

Fig 1: Locating Cover Lock
G10099969Courtesy of BMW OF NORTH AMERICA, INC.

Vehicles up to 07/2014: 

Slacken nut (1).

Tightening torque: 12 42 3AZ .

Remove positive battery cable from battery positive terminal.

Fig 2: Identifying Nut And Positive Battery Cable
G10099970Courtesy of BMW OF NORTH AMERICA, INC.

Vehicles from 07/2014: 

Loosen positive battery cable (1).

Tightening torque: 12 42 3AZ .

Release clamp (2).

Feed out positive battery cable.

Fig 3: Identifying Positive Battery Cable And Clamp
G10102284Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 4: 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 5: Identifying Protective Cap, Nut And Positive Battery Cable
G09914287Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Reassemble the vehicle.
Check stored fault messages.
Clear diagnostic fault entries from fault memory.