305 Operation
Engine compartment
Battery
Your vehicle is equipped with two batter-
ies:
Auxiliary battery (located in the engine
compartment).
Main battery (starter and electrical
consumers; located in the cargo com-
partment).
These batteries should always be suffi-
ciently charged in order to achieve their
rated service life. Refer to Maintenance
Booklet for battery maintenance intervals.
If you use your vehicle mostly for short-dis-
tance trips, you will need to have the bat-
tery charge checked more frequently.When replacing batteries, always use bat-
teries approved by Mercedes-Benz.
If you do not intend to operate your vehicle
for an extended period of time, consult an
authorized Mercedes-Benz Center about
steps you need to observe.
Batteries contain materials that can harm
the environment if disposed of improperly.
Recycling of batteries is the preferred
method of disposal. Many states require
sellers of batteries to accept old batteries
for recycling.
G
Observe all safety instructions
and precautions when handling
automotive batteries.
A
Risk of explosion.
D
Keep flames or sparks away
from battery. Do not smoke.
B
Battery acid is caustic. Do not
allow it to come into contact
with skin, eyes or clothing.
In case it does, immediately
flush affected area with clean
water and seek medical help if
necessary.
E
Wear eye protection.
C
Keep children away.
F
Follow the instructions in this
Operator's Manual.
424 Practical hintsBatteriesYour vehicle is equipped with two batter-
ies:
Main battery (battery for starter and
electrical consumers; located in the
cargo compartment).
Auxiliary battery (back-up battery; sta-
bilizes the electrical system if the main
battery is discharged; located in the en-
gine compartment).
Pull cover up and detach it.1Negative terminal
2Positive terminaliThe battery is located on the right-hand
side under a cover.
Warning!
G
Jump starting must only be done using the
designated terminal connections in the en-
gine compartment (
page 429).
447 Technical data
Electrical system
Electrical system
Model
E320/E3204MATIC
E 500
1/E 500 4MATIC
1Not available in the U.S.Generator (alternator)
14 V / 150 A
14 V / 150 A
Starter motor
14 V / 1.4 kW
14 V / 1.7 kW
Battery (auxiliary)
12 V / 12 Ah
12 V / 12 Ah
Battery (main)
12 V/95 Ah
12 V / 95 Ah
Spark plugs
Bosch F8 DPP 332U
NGK PFR 5R-11
Bosch F8 DPP 332U
NGK PFR 5R-11
Electrode gap
0.039 in (1.00 mm)
0.039 in (1.00 mm)
Tightening torque
18.5 - 22 lb-ft (25 - 30 Nm)
18.5 - 22 lb-ft (25 - 30 Nm)
