GMC CHEVROLET Silverado 6500HD 2019 Owner's Manual page 393

392 Service and Maintenance
cleaned and recoated with a
dielectric grease, paste or spray
protectant. The inspection/cleaning/
corrosion protection should include
feed-through connections, power
and ground cable connections for
batteries, engines, and the
starter stud.
Connectors that are more subject to
corrosion may be disassembled and
sprayed internally with a light
coating of dielectric grease. Use
grease sparingly, as too much
grease will not allow air to escape
from the connection, and this
compressed air will push out the
seals in the electrical connectors.
Accessory Feed Connections
Danger
Fuses and circuit breakers are
marked with their ampere rating.
Do not exceed the
specified amperage rating when
replacing fuses and circuit
breakers. Use of an oversized
(Continued)
Danger (Continued)
fuse or circuit breaker can result
in a vehicle fire. You and others
could be seriously injured or
killed.
Vehicle electrical systems are
complex and often include
electronic components, such as
engine and transmission controls,
instrument panels, antilock brakes.
While most systems still operate on
battery voltage (12 volts), some
systems can be as high as 90 volts
or as low as 5 volts. Refer to the
Electrical Circuit Diagram Manuals,
available from your GM dealer, to
ensure that any body lights and
accessories are connected to
circuits that are both appropriate
and not overloaded. No modification
should be made to any vehicle
control system without first
contacting your GM dealer.
Engine
General Information
For complete operation and
maintenance information pertaining
to your engine, refer to the Engine
Operation and Maintenance Manual
provided with the vehicle.
For effective emission control and
low operating cost, it is important
that maintenance operations be
performed at the specified periods
or mileage intervals indicated in the
Engine Operation and Maintenance
Manual.
Service intervals are based on
average operating conditions. In
certain environments and locations,
more frequent servicing will be
required.
The required maintenance
operations may be performed at a
service establishment. Any
replacement parts used for required
maintenance services or repairs
should be genuine OEM service
parts. Use of inferior replacement
parts hinders engine and emission