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Disconnecting and reconnecting the batteries
& WARNING Risk of explosion from hydro‐
gen gas igniting
A battery generates hydrogen gas during the
charging process. If there is a short circuit or
sparks start to form, there is a danger of the
hydrogen gas igniting.
Make sure that the positive terminal of
#
the connected battery does not come
into contact with vehicle parts.
Maintenance and care 331
Never place metal objects or tools on a
#
battery.
When connecting and disconnecting the
#
battery, you must observe the described
order for the battery clamps.
When giving starting assistance, always
#
make sure that you only connect battery
terminals with identical polarity.
During starting assistance, you must
#
observe the described order for con‐
necting and disconnecting the jump
lead.
Do not connect or disconnect the bat‐
#
tery clamps while the engine is running.
* NOTE Damage to the battery pole or bat‐
tery sensor
On vehicles with a battery sensor, the nega‐
tive terminal is part of the battery sensor.
If the negative terminal is not correctly
secured on the negative pole of the battery,
contact is not guaranteed. The battery sensor
or battery pole may be damaged as a result of
this.
Tighten the negative terminal on the
#
battery sensor with a tightening torque
+
of 7 Nm (
/
1 Nm).
-
Observe the safety notes on handling batteries.
Before disconnecting and reconnecting the bat‐
teries:
Semitrailer truck with batteries in the rear
#
area: detach the semitrailer (
Switch the ignition off.
#
Switch off all electrical consumers.
#
Remove the battery box cover.
#
To disconnect: disconnect the negative ter‐
#
minal first, and then disconnect the positive
terminal.
To connect: connect the positive terminal
#
first, and then connect the negative terminal.
Do not interchange the battery clamps.
Replace the battery box cover.
#
Carry out the following tasks after an interruption
to the power supply or after reconnecting the
batteries:
page 289).
/
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