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Home >> BMW >> 2012 >> Z4 28i, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Engine Electrical System - Repair (N20) -- Z4-E89 >> Starter And Alternator Cables >> 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: 

Open cover.

Slacken nut (1).

Tightening torque 12 42 3AZ .

Remove positive battery cable lead (2) from positive battery connection point.

Fig 1: Identifying Positive Battery Cable Lead And Nut
G06904082Courtesy 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 2: Identifying Alternator And Starter Motor Positive Battery Cable
G09914287Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Reassemble the vehicle.
Check stored fault messages.
Delete fault memory.