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

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Necessary preliminary tasks:

Read out fault memory of DME control unit
Switch off ignition
Disconnect Battery Negative Lead
Follow Instructions For Disconnecting And Connecting Battery
Remove Intake Air Manifold

Remove protective cap (not shown).

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

Tightening torque 12 42 1AZ in STARTER LEAD .

Fig 1: Identifying Battery Positive Lead To Battery And Retaining Nut

G04725692

Courtesy of BMW OF NORTH AMERICA, INC.

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

Tightening torque 12 31 1AZ.

Fig 2: Identifying Battery Positive Lead To Alternator And Retaining Nut

G04725693

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (1) and remove.

Unfasten nut.

For tightening torque refer to 12 41 3AZ in 12 41 STARTER MOTOR WITH MOUNTING .

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

Fig 3: Identifying Plug, Battery Positive Lead To Starter And Nut

G04725687

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check stored fault messages.

Now clear the fault memory.