2007 MERCEDES-BENZ G500 alternator

325 Practical hints
What to do if …
ProblemPossible cause/consequenceSuggested solution
-The yellow ABS indicator lamp
comes on while driving.The charging voltage has fallen below
10 volts. The ABS has switched off.
The battery might not be charged sufficiently.When the voltage is above this value
again, the ABS is operational again and
the ABS indicator lamp should go out.
If the ABS indicator lamp does not go out:
Have the generator (alternator) and
the battery checked.

344 Practical hints
What to do if …
Symbol messages
Display symbolDisplay messagePossible cause/consequencePossible solution
#The battery is no longer charging.
Possible causes:

alternator malfunctioning

broken poly-V-belt
Stop the vehicle in a safe location or as soon
as it is safe to do so.
Apply the parking brake (page 62).
Turn off the engine.
Check the poly-V-belt.
If it is broken:
Do not continue to drive.
Otherwise, the engine will overheat due to an
inoperative water pump which may result in
damage to the engine.
Contact an authorized Mercedes-Benz Light
Truck Center.
If it is in order:
Contact an authorized Mercedes-Benz Light
Truck Center immediately.

397 Practical hints
Battery
Warning!G
Failure to follow these instructions can
result in severe injury or death.
Observe all safety instructions and precau-
tions when handling automotive batteries
(
page 396).
Never lean over batteries while connecting,
you might get injured.
Battery fluid contains sulfuric acid. Do not
allow this fluid to come in contact with eyes,
skin or clothing. In case it does, immediately
flush affected area with water and seek
medical help if necessary.
A battery will also produce hydrogen gas,
which is flammable and explosive. Keep
flames or sparks away from battery, avoid
improper connection of jumper cables,
smoking, etc.
Warning!G
Jump starting must only be done using the
jump-start terminals located in the engine
compartment (
page 400).
Warning!G
Do not place metal objects on the battery as
this could result in a short circuit.
Use leak-proof battery only to avoid the risk
of acid burns in the event of an accident.
!Never loosen or detach battery terminal
clamps while the engine is running or the
SmartKey is in the starter switch. Otherwise the
alternator and other electronic components
could be severely damaged.
Have the battery checked regularly at an
authorized Mercedes-Benz Light Truck Center.
Refer to Maintenance Booklet for maintenance
intervals or contact an authorized
Mercedes-Benz Light Truck Center for further
information.

414 Technical data
Layout of poly-V-belt drive
For dimensions of the poly-V-belt, see
technical data (
page 415).
G500
1Automatic belt tensioner
2Power steering pump
3Air conditioning compressor
4Crankshaft
5Coolant pump
6Generator (alternator)
7Idler pulleyG55AMG
The G 55 AMG has two poly-V-belts
(belt one shown in purple/belt two shown
in black).
1Idler pulley
2Automatic belt tensioner
3Power steering pump
4Air conditioning compressor
5Crankshaft
6Coolant pump
7Generator (alternator)
8Idler pulley
9Automatic belt tensioner
aSupercharger

419 Technical data
Electrical system
Electrical system
ModelG500G55AMG
Generator (alternator)14 V/150 A14 V/180 A
Starter motor12 V/1.7 kW12 V/1.7 kW
Battery12 V/90 Ah12 V/90 Ah
Spark plugsBosch F 8 DPER
Beru 14 FGH 8 DPUR X 2NGK ILFR6A
Electrode gap0.039 in (1.0 mm)0.039 in (1.0 mm)
Tightening torque15–22lb-ft (20–30Nm)15–22lb-ft (20–30Nm)