OPERATOR'S MANUAL

Electrical System Preventive Maintenance
– 218 – Y53-6027
Medium Duty (R05/09)
ELECTRICAL SYSTEM
CAUTION: Do not modify or improperly repair
the vehicle’s electrical system or power distribu-
tion box. All electrical repairs should be per-
formed by an authorized Peterbilt dealer.
Improper repair or modifications will void your
warranty and/or cause serious damage to your
vehicle.
Location Of Fuses
Fuses are located inside the cab, left side, next to the driver’s
door.
Fuse Inspection and Replacement
WARNING! Do not replace a fuse with one of a
higher rating. Doing so may damage the electri-
cal system and cause a fire, possibly causing
death, personal injury or property damage.
CAUTION: Before replacing a fuse, turn OFF all
lights and accessories and remove the ignition
key to avoid damaging the electrical system.
WARNING! Never patch fuses with tin foil or
wire. This may cause serious damage elsewhere
in the electrical circuit, and it may cause a fire,
possibly causing death, personal injury or prop-
erty damage.
CAUTION: If a circuit keeps blowing fuses, have
the electrical system inspected for a short cir-
cuit or overload by an authorized Peterbilt dealer
as soon as possible. Failure to do so could
cause serious damage to the electrical system
and/or vehicle.
NOTE: If a fuse of the same rating is not available, a
fuse of a lower rating may be temporarily substi-
tuted. You can also use a fuse from a circuit you can
temporarily do without (for example, an accessory
circuit or radio).
BLOWN