2003 CHEVROLET SILVERADO fuse

The eight-wire harness contains the following trailer
circuits:
·Yellow: Left Stop/Turn Signal
·Dark Green: Right Stop/Turn Signal
·Brown: Taillamps
·White: Ground
·Light Green: Back-up Lamps
·Light Blue: CHMSL
·Red: Battery Feed
·Dark Blue: Trailer Brake
If your trailer is equipped with electric brakes, you can
get a jumper harness (electric trailer brake control)
with a trailer battery feed fuse from your dealer.
If you need to tow a light-duty trailer with a standard
four-way round pin connector you can also get an
adapter from your dealer.
Camper/Fifth-Wheel Trailer Wiring Package
The eight-wire camper harness is located under the
front edge of the pickup box on the driver's side of the
vehicle, attached to the frame bracket. A connector
will have to be added to the wiring harness which
connects to the camper.
The eight-wire harness contains the following
camper/trailer circuits:
·Yellow: Left Stop/Turn Signal
·Dark Green: Right Stop/Turn Signal
·Brown: Taillamps
·White: Ground
·Light Green: Back-up Lamps
·Light Blue: Center High-Mounted Stoplamp
(CHMSL)
·Red: Battery Feed
·Dark Blue: Trailer Brake
4-91

If your vehicle is equipped with the ªHeavy-Duty
Trailering²option, please refer toHeavy-Duty Trailer
Wiring Package, earlier in this section.
When the camper-wiring harness is ordered without the
heavy-duty trailering package, an eight-wire harness
with a seven-pin connector and separate CHMSL
connector are located at the rear of the vehicle and are
tied to the vehicle's frame.
Instrument Panel Jumper Wiring Harness
This harness may be included with your vehicle as part
of the heavy-duty trailer wiring package.
This harness is for an electric brake controller and
includes a trailer battery feed fuse. It should be installed
by your dealer or a quali®ed service center.
4-92

Auxiliary Battery
The auxiliary battery provision can be used to supply
electrical power to additional equipment that you
may choose to add, such as a slide-in camper.
If your vehicle has this
provision, this relay will be
located on the passenger's
side of the vehicle, next
to the auxiliary battery.When using this provision, connection should only be
made to the upper stud (A) of the relay. Do not
make connections to the lower stud (B) of the relay.
The auxiliary battery circuit is protected by a megafuse
located behind the auxiliary battery.
Be sure to follow the proper installation instructions that
are included with any electrical equipment that you
install.
Notice:When using the auxiliary battery provision,
the electrical load must not exceed 30 amps.
Always turn off any electrical equipment when not
in use. Leaving electrical equipment on for extended
periods will drain your battery.
Power Winches
If you wish to use a power winch on your vehicle, only
use it when your vehicle is stationary or anchored.
4-94

Bulb Replacement..........................................5-59
Halogen Bulbs..............................................5-59
Headlamps..................................................5-59
Front Turn Signal, Sidemarker and Daytime
Running Lamps.........................................5-61
Roof Marker Lamps......................................5-62
Center High-Mounted Stoplamp (CHMSL) and
Cargo Lamp.............................................5-63
Pickup Box Identi®cation and Fender Marker
Lamps.....................................................5-65
Taillamps.....................................................5-65
Replacement Bulbs.......................................5-67
Windshield Wiper Blade Replacement..............5-68
Tires..............................................................5-69
In¯ation -- Tire Pressure................................5-69
Dual Tire Operation.......................................5-70
Tire Inspection and Rotation...........................5-71
When It Is Time for New Tires.......................5-73
Buying New Tires.........................................5-74
Uniform Tire Quality Grading..........................5-75
Wheel Alignment and Tire Balance..................5-76
Wheel Replacement......................................5-76
Tire Chains..................................................5-78
If a Tire Goes Flat........................................5-79
Changing a Flat Tire.....................................5-80Appearance Care..........................................5-100
Cleaning the Inside of Your Vehicle...............5-100
Care of Safety Belts....................................5-103
Weatherstrips.............................................5-103
Cleaning the Outside of Your Vehicle.............5-103
Sheet Metal Damage...................................5-105
Finish Damage...........................................5-106
Underbody Maintenance...............................5-106
Chemical Paint Spotting...............................5-106
Vehicle Care/Appearance Materials................5-107
Vehicle Identi®cation.....................................5-108
Vehicle Identi®cation Number (VIN)................5-108
Service Parts Identi®cation Label...................5-109
Electrical System..........................................5-109
Add-On Electrical Equipment.........................5-109
Windshield Wiper Fuses...............................5-109
Power Windows and Other Power Options......5-109
Fuses and Circuit Breakers..........................5-110
Capacities and Speci®cations........................5-118
Capacities and Speci®cations........................5-118
Normal Maintenance Replacement Parts.........5-121
Section 5 Service and Appearance Care
5-2

CAUTION: (Continued)
·
Be sure to use the proper nuts, bolts and
other fasteners. ªEnglishº and ªmetricº
fasteners can be easily confused. If you
use the wrong fasteners, parts can later
break or fall off. You could be hurt.
Adding Equipment to the Outside of
Your Vehicle
Things you might add to the outside of your vehicle can
affect the air¯ow around it. This may cause wind
noise and affect windshield washer performance. Check
with your dealer before adding equipment to the
outside of your vehicle.
Fuel
If your vehicle has a diesel engine, see ªDiesel Fuel
Requirements and Fuel Systemº in the Diesel Engine
Supplement.
For vehicles with gasoline engines, please read this.
Gasoline Octane
For all except the Silverado SS model, use regular
unleaded gasoline with a posted octane of 87 or higher.
If the octane is less than 87, you may get a heavy
knocking noise when you drive. If this occurs, use a
gasoline rated at 87 octane or higher as soon as
possible. Otherwise, you might damage your engine. A
little pinging noise when you accelerate or drive
uphill is considered normal. This does not indicate a
problem exists or that a higher-octane fuel is necessary.
If you are using 87 octane or higher-octane fuel and
hear heavy knocking, your engine needs service.
If you have the Silverado SS model, use premium
unleaded gasoline with a posted octane of 91 or higher
for best performance. You may also use middle
grade or regular unleaded gasoline rated at 87 octane
or higher, but your vehicle's acceleration may be slightly
reduced. If the octane is less than 87, you may get a
heavy knocking noise when you drive. If this occurs, use
gasoline rated at 87 octane or higher as soon as
possible. Otherwise, you might damage your engine.
5-4

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-21.
B. Coolant Surge Tank. See
Engine Coolant on
page 5-30.
C. Air Filter Restriction Indicator (If Equipped). See
Engine Air Cleaner/Filter on page 5-21.
D. Engine Oil Dipstick. See
Engine Oil on page 5-16.
E. Automatic Transmission Dipstick (If equipped).
See
Automatic Transmission Fluid (Except Allison
Transmissionž) on page 5-23orAutomatic
Transmission Fluid (Allison Transmissionž)on
page 5-26.
F. Fan. See
Cooling System on page 5-36.
G. Engine Oil Fill. See
Engine Oil on page 5-16.H. Power Steering Fluid Reservoir. See
Power Steering
Fluid on page 5-42.
I. Remote Negative (-) Terminal (GND). See
Jump
Starting on page 5-48.
J. Remote Positive (+) Terminal. See
Jump Starting on
page 5-48.
K. Brake Fluid Reservoir. See
Brakes on page 5-44.
L. Clutch Fluid Reservoir (If Equipped). See
Hydraulic
Clutch on page 5-29.
M. Underhood Fuse Block. See
Fuses and Circuit
Breakers on page 5-110.
N. Battery. See
Battery on page 5-47.
O. Windshield Washer Fluid Reservoir. See
Windshield
Washer Fluid on page 5-43.
5-11

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-21.
B. Coolant Surge Tank. See
Engine Coolant on
page 5-30.
C. Air Filter Restriction Indicator (If Equipped). See
Engine Air Cleaner/Filter on page 5-21.
D. Engine Oil Dipstick. See
Engine Oil on page 5-16.
E. Automatic Transmission Dipstick (If Equipped).
See
Automatic Transmission Fluid (Except Allison
Transmissionž) on page 5-23orAutomatic
Transmission Fluid (Allison Transmissionž)on
page 5-26.
F. Engine Oil Fill. See
Engine Oil on page 5-16.
G. Fan. See
Cooling System on page 5-36.H. Remote Negative (-) Terminal (GND). See
Jump
Starting on page 5-48.
I. Power Steering Fluid Reservoir. See
Power Steering
Fluid on page 5-42.
J. Remote Positive (+) Terminal. See
Jump Starting on
page 5-48.
K. Brake Fluid Reservoir. See
Brakes on page 5-44.
L. Clutch Fluid Reservoir (If Equipped). See
Hydraulic
Clutch on page 5-29.
M. Underhood Fuse Block. See
Fuses and Circuit
Breakers on page 5-110.
N. Battery. See
Battery on page 5-47.
O. Windshield Washer Fluid Reservoir. See
Windshield
Washer Fluid on page 5-43.
5-13

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-21.
B. Coolant Surge Tank. See
Engine Coolant on
page 5-30.
C. Air Filter Restriction Indicator (If Equipped). See
Engine Air Cleaner/Filter on page 5-21.
D. Engine Oil Dipstick. See
Engine Oil on page 5-16.
E. Automatic Transmission Dipstick (If Equipped).
See
Automatic Transmission Fluid (Except Allison
Transmissionž) on page 5-23orAutomatic
Transmission Fluid (Allison Transmissionž)on
page 5-26.
F. Engine Oil Fill. See
Engine Oil on page 5-16.
G. Fan. See
Cooling System on page 5-36.H. Remote Negative (-) Terminal (GND). See
Jump
Starting on page 5-48.
I. Remote Positive (+) Terminal. See
Jump Starting on
page 5-48.
J. Power Steering Fluid Reservoir. See
Power Steering
Fluid on page 5-42.
K. Brake Fluid Reservoir. See
Brakes on page 5-44.
L. Clutch Fluid Reservoir (If Equipped). See
Hydraulic
Clutch on page 5-29.
M. Underhood Fuse Block. See
Fuses and Circuit
Breakers on page 5-110.
N. Battery. See
Battery on page 5-47.
O. Windshield Washer Fluid Reservoir. See
Windshield
Washer Fluid on page 5-43.
5-15