61 14... Removing and installing/replacing reverse polarity protection

Necessary preliminary tasks: 

• Disconnect BATTERY EARTH LEAD 

Slacken nut (1).

Open cover (2) and the nut underneath.

Remove clip (3).

Take off reverse polarity protection (4).

Fig 1: Identifying Reverse Polarity Protection And Slacken Nut

Courtesy of BMW OF NORTH AMERICA, INC.