Mercedes-Benz G-Class Owner's Manual page 125

Warning and indicator lamps in the instrument cluster
Problem
%
The preglow indicator
lamp lights up while the
engine is running.
#
The red battery warning
lamp lights up while the
engine is running.
#
The red battery warning
lamp lights up during or
after fording.
+
The red coolant warn-
ing lamp comes on
while the engine is run-
ning.
Possible causes/consequences and M Solutions
The preglow system is malfunctioning.
X
Visit a qualified specialist workshop immediately.
The battery is not being charged. Possible causes:
faulty alternator
R
torn poly-V-belt
R
an electronics fault
R
X
Stop.
X
Check the poly-V-belt.
X
If it is torn: do not drive on.
X
Consult a qualified specialist workshop.
X
If it is not damaged: have the vehicle checked immediately at
a qualified specialist workshop.
The poly-V-belt is wet and is slipping on the drive pulley.
X
Drive on carefully.
X
Accelerate gently.
X
Do not switch off the engine.
The poly-V-belt will dry out after fording. The red battery charge
indicator lamp goes out after 15 seconds.
The coolant level is too low.
The coolant is too hot and the engine is no longer being cooled
sufficiently.
X
Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the engine.
X
Apply the parking brake.
X
Leave the vehicle and keep a safe distance from the vehicle until
the engine has cooled down.
X
Check the coolant level and top up the coolant, observing the
warning notes ( Y page 143).
X
If you have to top up the coolant frequently, have the engine
cooling system checked.
X
Drive to the nearest qualified specialist workshop.
X
Avoid subjecting the engine to heavy loads, e.g. driving in moun-
tainous terrain, and stop-start driving.
123
Z