Page 120 of 208
Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box Description
7 15A* Stop Lamps
8 25A* C AT Fuel Heater
9—Not Used
10 15A* Shift Modulator (Allison AT trans only)
11 20A* Allison MD Trans
12—Not Used
13—Not Used
14—Not Used
15 7.5A*
Body Builder Prep (Hydraulic Vehicles Only)
16—Not Used
17—Not Used
18—Not Used
19—Not Used
20—Not Used
21 10A* GEM (Hydraulic Vehicles Only)
22—Not Used
23—Not Used
24—Not Used
101 40A** ABS (Air Only)
102 20A** Body Builder Prep Run Feed
103 50A** Ignition Switch (JB fuses 8, 9, 11, 19, 20,
22, 23, 24, 25, 29, 30, 31)
104 20A** Power Point
105 20A** Power Door Locks
106 30A** Headlamps
107 50A** Junction Box Battery Feed (fuses 1, 2, 3, 4,
12, 13, 14, 15)
108 40A** Cummins Fuel Heater
109 40A** Power Windows
110—Not Used
111 30A** Body Builder Prep
Roadside emergencies
120
Page 159 of 208

Driving style—good driving and fuel economy habits
Give consideration to the lists that follow and you may be able to change
a number of variables and improve your fuel economy.
Habits
•Smooth, moderate operation can yield up to 10% savings in fuel.
•Steady speeds without stopping will usually give the best fuel
economy.
•Anticipate stopping; slowing down may eliminate the need to stop.
•Sudden or hard accelerations may reduce fuel economy.
•Slow down gradually.
•Driving at reasonable speeds (traveling at 88 km/h [55 mph] uses 15%
less fuel than traveling at 105 km/h [65 mph]).
•Using the air conditioner or defroster may reduce fuel economy.
•Resting your foot on the brake pedal while driving may reduce fuel
economy.
Conditions
•Carrying unnecessary weight may reduce fuel economy.
•Fuel economy may decrease with lower temperatures during the first
12–16 km (8–10 miles) of driving.
•Flat terrain driving improves fuel economy over hilly roads.
•Transmissions give their best fuel economy when operated in the top
cruise gear and with steady pressure on the accelerator.
•Close windows for highway driving.
EXTERIOR BULBS
Check operation of lamps, safety equipment and warning signals
It is a good safety practice to check operation of headlamps, parking
lamps, turn signals, clearance and marker lamps, instrument panel and
control lamps each day.
Replacing headlamp bulbs
To remove the headlamp bulbs:
1. Make sure headlamp switch is in OFF position.
Maintenance and care
159
Page 160 of 208
2. Open the hood.
3. Remove four screws and move
the parking lamp assembly away
from the headlamp bulb.
4. Remove four screws and the
retaining bracket from the headlamp
bulb.
5. Pull headlamp bulb out of the
housing, disconnect the electrical
connector and remove the headlamp
bulb.
6. To complete installation, follow
the removal procedure in reverse
order.
Replacing front parking lamp/turn signal bulbs
To remove the parking/turn signal bulbs:
1. Make sure the headlamp control is in the OFF position.
2. Open the hood.
Maintenance and care
160
Page 162 of 208
Replacing brake/tail/backup lamp bulbs
The brake/tail/backup lamp bulbs
are located in the same portion of
the tail lamp assembly. Follow the
same steps to replace either bulb:
1. Remove the four screws and the
lamp lens from lamp assembly.
2. Carefully pull the bulb straight
out of the socket and push in the
new bulb.
3. Install the lens on the lamp
assembly with the four screws.
Using the right bulbs
Function Number of
bulbsTrade number
Headlamps 2 4652
Park/turn signal 2 1157
Sidemarker 4 1895
Brake/tail 2 3157
Backup 4 1156
Cabmarker 5 168
Rear fender clearance 4
(a)
Rear identification 3 194
Dome lamp 1 105
To replace all instrument panel lights - see your dealer
(a)Replace entire lamp assembly; bulb is not serviceable.
Maintenance and care
162
Page 163 of 208

AIMING THE HEADLAMPS
The headlamps on your vehicle are properly aimed at the assembly plant.
If your vehicle has been in an accident the alignment of your headlamps
should be checked by a qualified service technician.
MINOR TROUBLESHOOTING GUIDE
Diesel engine
For troubleshooting information, refer to the diesel engine operator’s
manual.
If engine won’t crank
For troubleshooting information, refer to the engine operator’s manual.
If engine cranks but won’t start
For troubleshooting information, refer to the engine operator’s manual.
If engine runs hot
For troubleshooting information, refer to the engine operator’s manual.
If fuses burn out
Burned-out or“blown-out”fuses or circuit breaker tripping (if equipped)
usually indicate an electrical short circuit, although a fuse may
occasionally fail from vibration. Insert a second fuse or reset the breaker
(if equipped). If this fuse immediately burns out or the breaker (if
equipped) trips and you cannot locate the fuse, return your vehicle to
your dealer for a circuit check.
If lamp bulbs burn out
Repeated lamp burn-out usually indicates a loose connection, either at
the lamp socket, the system ground or a malfunctioning voltage
regulator. If examination does not indicate the cause of the trouble,
return your vehicle to your dealer for inspection.
If headlamps flash on and off
If headlamps flash on and off at regular intervals, the system circuit
breaker (if equipped) is operating, indicating a short circuit or overload.
Take your vehicle to your dealer for a circuit check.
Maintenance and care
163
Page 187 of 208
Maintenance Operation Frequency — ObservationClean body/door drain holes.
Clean windshield wiper blades.
Replace windshield wiper blades.
Lubricate body lock cylinders, door and hood hinges.
Check headlamp alignment.
Check windshield washer fluid level. Add fluid if required.At least twice annually.
As required.
If wiping the blades with a clean cloth and mild detergent
and washing the windshield with a cleaner does not restore
a clean wipe.
Difficult to operate or noisy.
Lamp beams in wrong position when vehicle operating
loaded.
If washers do not spray fluid when operated. GENERAL MAINTENANCE SERVICES
Listed below are vehicle checks that should be made periodically either by the owner or a qualified technician. It is recommended
that deficiencies be brought to the attention of your dealer or another qualified service outlet as soon as possible in order that
advice regarding the need for service or replacement can be obtained.
General maintenance information
187
Page 206 of 208

calculating
fuel economy ...................112,157
choosing the right fuel ...........152
filling your vehicle with fuel ..151
filter, specifications .........154,155
gauge .........................................16
improving
fuel economy ...................112,157
safety information relating to
automotive fuels .....................151
Fuses ...................................115,116
Gas mileage
(see Fuel economy) ..........112,157
Gauges .........................................16
battery voltage gauge ...............18
engine coolant
temperature gauge ...................16
engine oil pressure gauge ........19
fuel gauge ..................................16
odometer ...................................17
speedometer .............................17
tachometer ................................18
trip odometer ............................18
Hazard flashers .........................115
Headlamps ...................................20
aiming ......................................163
daytime running lights .............20
flash to pass ..............................50
high beam ............................12,50
turning on and off ....................20
warning chime ..........................15
Heating ........................................21
heater only system ...................21
heating and
air conditioning system ............23
Hood ..........................................126
Ignition
positions of the ignition ...........49
removing the key ....................101
Infant seats
(see Safety seats) ..................72,73Instrument panel
cleaning ...................................166
cluster ......................................167
lighting up
panel and interior .....................20
location of components ............10
Jump-starting your vehicle ......125
Keys
key in ignition chime ...............15
positions of the ignition ...........49
removing from the ignition ....101
Lamps
cargo lamps ...............................20
daytime running light ...............20
headlamps .................................20
headlamps, flash to pass ..........50
instrument panel, dimming .....20
replacing bulbs ..159,160,161,162
Lane change indicator
(see Turn signal) ........................49
Lights, warning and indicator ....10
anti-lock brakes (ABS) .......12,83
brake .....................................10,11
charging system ........................10
check coolant ............................14
high beam .................................12
safety belt .................................14
service engine soon ..................14
turn signal indicator .................12
Lubricant specifications ...........169
Maintenance and Care ..............179
Manual transmission ...................97
Mirrors .........................................57
Odometer .....................................17
Parking brake ....................85,87,90
Power distribution box
(see Fuses) ...............................119
Power door locks ........................56
Power steering .......................95,96
fluid, checking and adding ....136
Radio ............................................26
Refill capacities for fluids ........168
Index
206