2005 MERCEDES-BENZ SLR alternator

310 Practical hintsWhat to do if ...Left display
Right display
Possible cause
Possible solution
#
Electric
consumers
offline!
The consumer battery has in-
sufficient voltage and can no
longer supply the convenience
functions.
The electrical consumers will come back online as soon as
on-board voltage is sufficient.
Battery/
Alternator
Stop vehicle!
The battery or the alternator is
malfunctioning.
The SBC brake system requires
electrical energy and therefore
has only limited operation.
Considerably greater brake
pedal force is required and the
stopping distance is increased.

Stop the vehicle as soon as it is safe to do so. Adjust driv-
ing to be consistent with reduced braking responsive-
ness.

Notify an authorized Mercedes-Benz Center immediate-
ly.

Observe the additional messages in the instrument clus-
ter.
Failure to follow these instructions increases the risk of an
accident.

311 Practical hints
What to do if ...
Left display
Right display
Possible cause
Possible solution
#
Visit
workshop!
The battery is no longer charg-
ing. Possible causes:

alternator malfunctioning


broken poly-V-belt
Do not forget that the brake
system requires electrical ener-
gy and may be operating with
restricted capability. Consider-
ably greater brake pedal force
is required and the stopping
distance is increased.

Stop your vehicle safely immediately and 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. Notify an
authorized Mercedes-Benz Center.
If it is in order:

Drive immediately to the nearest authorized
Mercedes-Benz Center. Adjust driving to be consis-
tent with reduced braking responsiveness.

Observe the additional messages in the instrument
cluster.
There is a malfunction in the
electronic system.

Have the system checked at an authorized
Mercedes-Benz Center immediately.

367 Technical data
Layout of poly-V-belt drive
Layout of poly-V-belt drive
The SLR 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
5Idler pulley
6Crankshaft
7Coolant pump
8Generator (alternator)
9Idler pulley
aAutomatic belt tensioner
bSupercharger

372 Technical dataElectrical systemGenerator (alternator)
14 V/150 A
Starter motor
12 V/1.7 kW
BatteryStarter battery
12 V/35 Ah
Battery for electrical consumers
12 V/70 Ah
Spark plugs
NGK ILFR6A
Electrode gap
0.031 in (0.8 mm)
Tightening torque
18 – 22 lb-ft (25 – 30 Nm)

388 Technical termsOverspeed range
Engine speeds within the red marking
on the tachometer dial. Avoid this en-
gine speed range, as it may result in se-
rious engine damage that is not
covered by the Mercedes-Benz Limited
Warranty.
Poly-V-belt drive
Drives engine-components (alternator,
AC compressor, etc.) from the engine.
Power train
Collective term designating all compo-
nents used to generate and transmit
motive power to the drive axles, includ-
ing


engine


clutch/torque converter


transmission


transfer case


drive shaft


differential


axle shafts/axlesProduction options weight
(
page 279)
Program mode selector switch
Used to switch the automatic transmis-
sion between sport operation (S), com-
fort operation (C) and manual
operation (MAN).
PSI
(Pounds per s
quare i
nch)
(
page 280)
Recommended tire inflation pressure
(page 280)
REST
(Residual Engine Heat Utilization)
Feature that uses the engine heat
stored in the coolant to heat the vehi-
cle interior for a short time after the en-
gine has been turned off.
Rim
(page 280)RON
(R
esearch O
ctane N
umber)
The Research Octane Number for gaso-
line as determined by a standardized
method. It is an indication of a gaso-
line's ability to resist undesired detona-
tion (knocking). The average of both
the MON (Motor Octane Number) and
RON (Research Octane Number) is
posted at the pump, also known as
ANTI-KNOCK INDEX.
SBC brake system
(S
ensotronic B
rake C
ontrol)
Electronically controlled hydraulic
braking system for increased braking
safety and comfort.
Shift lock
When the vehicle is parked, this lock
prevents the gear selector lever from
being inadvertently moved out of posi-
tion P without SmartKey turned and
brake pedal depressed.