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
Observe instructions for disconnecting and connecting battery
Remove intake air manifold

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

Tightening torque 12 42 1AZ .

Fig 1: Identifying Battery Positive Lead

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 And Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (1) and remove.

Unfasten nut.

Tightening torque 12 41 3AZ .

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

Fig 3: Identifying Battery Positive Lead And Plug

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check stored fault messages.
Now clear the fault memory.