Volvo VNL 780 Operator's Manual page 456

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446
MAINTENANCE AND LUBRICATION
Battery, Low State of Charge
If the batteries are discharged to the point where they do not have enough stored energy
to start the engine, they should be recharged using a low charge current, not to exceed
14.5 to 15.0 volts.
If the vehicle needs to be started immediately, use a starting batteries charger.
Note: If the voltage power is exceeded, this can cause damage to the lighting system and
bulbs.
DO NOT use battery chargers with very high "boosting" capability. These produce a high
voltage that may cause damage to the vehicle electrical and electronic components.
Welding
CAUTION
Welding on the vehicle can damage the
electrical system or components due
to the high voltage and current spikes
that normally occur when welding. It
is preferable to avoid welding on an
assembled vehicle. However, if any
structure on or in contact with the
vehicle must be welded, follow the
recommendations below.

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