Battery, Checking And Cleaning; To Remove Battery Corrosion - BMW 1999-2005 M3 Service Manual

Maintenance
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Other Mechanical
Maintenance

Battery, checking and cleaning

The battery is located in the right side
of the luggage compartment. Simple
maintenance of the battery and its
terminal connections will ensure
maximum starting performance,
especially in winter when colder
temperatures reduce battery power.
Note:
Design characteristics of the
convertible body cause vibrations in the
trunk area. Therefore, E46 Convertibles
require a special battery designed for
constant vibration. When replacing the
battery, be sure the replacement is
designed specifically for the
Convertible.
Battery cables should be tight. The
terminals, the cable clamps, and the
battery case should be free of the white
deposits that indicate corrosion and
acid salts. Even a thin layer of dust
containing conductive acid salts can
cause battery discharge.
-

To remove battery corrosion:

Disconnect battery cables.
Disconnect negative (-) cable first.
Remove battery from trunk.
Clean terminal posts and cable
clamps with a wire brush.
020-6
2/25/2009 10:03 PM