MAINTENANCE, LUBRICATION AND SERVICE
ELECTRICAL SYSTEM
Precautions When Installing
Electrical Equipment
Connecting electrically powered or
electrically controlled equipment to a
vehicle may cause interference with
other vehicle electrical or electronic
equipment (such as ABS systems,
Rollover Stability Systems, etc.). The
amount of interference depends upon
the operating frequency of any new
signals and the degree to which
transient signals are coupled to the
vehicle system.
NOTE
Whenever new electrical equipment is
installed, it is the obligation of the installer
to ensure that the new equipment does
not interfere with the proper operation of
all other electrical systems on the vehicle.
If new electrical equipment is installed, a
vehicle checkout procedure should be
performed.
1
Perform the checkout procedure
under the following conditions:
• Engine running
• Brake system air pressure in
operating range
• Vehicle stationary
• Brake pedal fully depressed
2
Operate the new equipment under all
starting, running and shutdown
conditions.
3
Listen for signs of air exhausting
from the ABS modulator valves
(which is an indication of an
interference condition).
4
Correct all interference conditions
before operating the vehicle.
NOTE
The center pin of the standard seven-pin
trailer electrical connector has been
standardized as the dedicated connection
for uninterrupted power for trailer ABS.
This pin is always powered when the
tractor ignition is turned on.
DANGER
Some trailers manufactured prior to the
trailer ABS regulations may use the center
pin to power certain trailer auxiliary
equipment. The possibility exists that this
auxiliary equipment may be unexpectedly
activated by the truck or tractor electrical
system, resulting in personal injury or
damage to equipment. Caution must be
used when connecting the trailer electrical
connector to ensure that power to the
center pin will not unintentionally activate
any trailer auxiliary equipment.
Fuses and Relays
The truck's fuses are designed to
protect the electrical system's circuits
from overload and are usually only
tripped as a result of a short circuit. For
this reason, if a fuse has blown you
should always have an authorised Volvo
workshop determine the cause.
WARNING
Always replace fuses with the correct
rating. Never overfuse.
Never install a fuse higher than the
instructed rating.
Main Fuse
The main fuse is located in a box
located inside the battery box
compartment.The main fuse amperage
is 150. Normally, the main fuse lasts for
the lifetime of the vehicle. If the fuse
does blow then the truck should be
taken to an authorised workshop for
inspection of the electrical system.
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