Electrical System; Fuses; Battery - Mercedes-Benz 300SD 1981 Owner's Manual

Fuses

The fuse box is located in the engine
compartment.
All fuse protected equipment is
shown in the lid of the fuse box.
Fuse arrangement in the box —
starting at the engine side and
proceeding outwards —
RH row: odd numbers 1, 3, 5, etc. up
to 13; LH row: even numbers 2, 4,6,
etc. up to 14.
Fuses must not be repaired or
bridged.
Spare fuses are stored in the fuse box
(observe amperage and color code).
Before changing a burned out fuse,
determine the cause of the short
circuit.
After replacing a fuse, engage lid of
fuse box at rear and lock with clamp
at front.

Battery

Replenish with distilled water approxi­
mately every 4 weeks and more often
during the summer and in hot areas.
Do not use metal funnels and do not
perforate the diaphragm of the bat­
tery overfill protection.
The battery is filled to the maximum
level when the water level in the cell
filling chamber stops going down.
E lectrical System
If battery acid is to be extracted for
battery diagnosis purposes, perforate
the diaphragm with the hydrometer or
the tube attached to it.
Coat battery terminal clamps with
acidproof grease. Keep battery clean
and dry.
Only tow vehicle with the battery
connected.
Only charge battery with a battery
charger when it is disconnected from
the vehicle electrical circuit.
Note:
While the engine is running the
battery terminal clamps must not be
loosened or detached as otherwise
the alternator and other electronic
units would be damaged.
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