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244 Electrical System
Electrical System
General Safety Guidelines
WARNING
Failure to repair a malfunction in the
electrical system can result in serious
damage due to vehicle fire. Always let an
experienced electrical technician perform
repairs. Always determine the source of
the fault; do not just treat the symptoms.
WARNING
Always wear eye protection when work-
ing around batteries to prevent the risk
of injury due to contact with sulfuric
acid or an explosion.
WARNING
Before replacing a damaged fuse, turn
off all functions for that circuit. Damage
to the circuit can happen. Always re-
place fuses and circuit breakers with the
same current/amperage rating. Never
substitute a fuse with foil, wire or nails.
Increasing fuse or circuit breaker ratings
or substituting a fuse with foil, wire or
nails may result in electrical circuit
overheating and possibly fire.
CAUTION
Attempting to work on electronic com-
ponents without proper equipment can
damage internal parts with static elec-
tricity.
CAUTION
Electronic circuits and components are
designed to sense voltage differences
smaller than 1 volt. While static electric-
ity is not normally dangerous to humans,
it can seriously damage electronic cir-
cuits and components. Circuit boards
mounted in the instrument cluster, for
example, may not fail immediately after
being hit with a static discharge. Rather,
they may work for a while and then fail
for no apparent reason. Therefore, al-
ways work with proper grounding straps
and antistatic mats around electric com-
ponents.
CAUTION
Today’s vehicles contain a high number
of electronic devices. It is very impor-
tant to exercise caution when working
on a modern electrical system, charging
batteries or jump starting the engine. To
minimize the risk of any damage to the
electronic components, follow the proce-
dures below when work is being done to
the electrical system.
NOTE! Do not work on the electric system
without proper tools and training. Repair-
work to the electrical system must be done
by trained professionals. Your Volvo Truck
dealer has the right tools and trained tech-
nicians.