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Always replace the cover to the Power Distribution Box before
reconnecting the battery or refilling fluid reservoirs.
If the battery has been disconnected and reconnected, refer to the
Batterysection of theMaintenance and carechapter.
The high-current fuses are coded as follows.
Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box Description
1 Ð Not Used
2 Ð Not Used
3 Ð Not Used
4 10A* PCM Keep Alive Memory, Instrument
Cluster, Voltmeter
5 10A* Right Trailer Turn Signal
6 10A* Left Trailer Turn Signal
7 Ð Not Used
8 60A** I/P Fuses 5, 11, 23, 38, 4, 10, 16, 22, 28,
32
AB3
2
146 5715 14 13 12 11 10 9 823 22 21 20 19 18 17 1624 26 25 27
29
CDG F EK J H
28
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Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box Description
9 30A** PCM Power Relay, Engine Compartment
Fuse 4
10 60A** Auxiliary Battery Relay, Engine
Compartment Fuses 14, 22
11 30A** IDM Relay (Diesel Only)
12 60A** Engine Compartment Fuses 25, 27
13 50A** Blower Motor Relay (Blower Motor)
14 30A** Trailer Running Lamps Relay, Trailer
Backup Lamps Relay
15 40A** Main Light Switch, Daytime Running
Lights (DRL)
16 50A** Auxiliary Blower Motor Relay
17 30A** Fuel Pump Relay
18 60A** I/P Fuses 40, 41,26, 33, 39
19 60A** 4WABS Module
20 20A** Electric Brake Controller
21 50A** Modified Vehicle Power
22 40A** Trailer Battery Charge Relay, Modified
Vehicles
23 60A** Ignition Switch, Fuse Panel
24 Ð Not Used
25 20A* NGV Module (Natural Gas Only)
26 10A* A/C Clutch (4.2L Only)
27 15A* DRL Module, Horn Relay
28 Ð PCM Diode
29 Ð Not Used
A Ð Not Used
B Ð Stop Lamp Relay
C Ð Trailer Backup Lamps Relay
D Ð Trailer Running Lamps Relay
E Ð Trailer Battery Charge Relay
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Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box Description
F Ð IDM Relay (Diesel Only), A/C Clutch
Relay (4.2L Only)
G Ð PCM Relay
H Ð Blower Motor Relay
J Ð Horn Relay
K Ð Fuel Pump Relay
* Mini Fuses ** Maxi Fuses
Relays
Relays are located in the power distribution box and should be replaced
by qualified technicians.
CHANGING THE TIRES
If you get a flat tire while driving, do not apply the brake heavily.
Instead, gradually decrease your speed. Hold the steering wheel firmly
and slowly move to a safe place on the side of the road.
Spare tire information
The spare tire for your vehicle is stowed under the rear of your vehicle
(except cutaway and stripped chassis models).
To remove the spare tire:
1. Open both rear doors and remove
thumb screw and anti-theft bracket.
If finger pressure will not remove
the thumb screw, use the lug
wrench to loosen the screw.
2. Remove the access cover from
the rubber strip behind the left
door.
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3. Remove the jack handle from the
right side compartment and insert
the tip of the jack handle through
the access hole and into the tube.
4. Turn the jack handle
counterclockwise until the cable is
slack and the tire can be slid
rearward from under the vehicle.
5. Remove the retainer from the
spare tire.
To stow the cable retainer with the spare removed, turn the jack handle
clockwise until all slack is removed.
To stow the spare tire:
1. Lay the tire on the ground under the rear of the vehicle with the valve
stem facing up.
Stow aluminum wheels with valve stem facing down.
2. Install the retainer through the wheel center.
3. Raise the tire by turning the jack
handle clockwise. Continue until the
lift mechanism ªclicks.º
4. Check that the tire is tightly
seated under the vehicle by pushing
against the tire. Retighten as
necessary.
5. Replace the access cover,
anti-theft bracket and thumb screw.
Use finger pressure only to secure the thumb screw.
Make sure the spare tire and jacking equipment are stowed and
secured in the proper storage location.
Never run the engine with one wheel off the ground.
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Tire change procedure
Preparing to change the tire
To prevent the vehicle from moving when you change a tire, be
sure the parking brake is set, then block (in both directions) the
wheel that is diagonally opposite (other side and end of the vehicle) to
the tire being changed.
1. Park on a level surface.
2. Activate the warning flashers.
3. Place the gearshift in P (Park)(automatic transmission).
4. Apply the parking brake and turn
engine OFF.
5. Block the wheel that is diagonally
opposite the tire you are changing.
On E-450 vehicles, the parking
brake is on the transmission.
Therefore, the vehicle will not be
prevented from moving when a rear
wheel is lifted, even if the parking
brake is applied. Be sure to block both directions of the wheel that is
diagonally opposite to the wheel that is being lifted.
If the vehicle slips off the jack, you or someone else could be
seriously injured.
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6. Remove the spare tire and jack
from the storage location.
7. Use the tapered end of the lug
nut wrench to unscrew wheel
ornaments attached by retaining
screws. Remove any wheel trim.
Insert the tapered end of the lug
nut wrench behind wheel covers or
hubcaps and twist off.
8. Loosen the wheel nut by pulling
up on the handle of the lug nut
wrench about one-half turn
(counterclockwise). Do not remove
the wheel lug nuts until you raise
the tire off the ground.
Replacing the tire
1. Assemble the jack handle sections together and lock into jack. Use the
jack handle to slide the jack under the vehicle.
To lessen the risk of personal injury, do not put any part of your
body under the vehicle while changing a tire. Do not start the
engine when your vehicle is on the jack. The jack is only meant for
changing the tire.
2. Position the jack to raise the front or rear wheel.
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²Never use the front or rear
differential as a jacking point.
Rear axle jacking points:
²All models except E-Super Duty
²E-Super Duty
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Front axle jacking points:
²All models
Place the jack under thepinon the
front surface of the front axle.
Do not place the jack under or
on the steering linkage.
3. Turn the jack handle clockwise
until the wheel is completely off the
ground.
4. Remove the lug nuts with the lug
nut wrench.
5. Replace the flat tire with the
spare tire.
If your vehicle has single rear wheels, thread the lug nuts on the studs
with the beveled face toward the wheel.
If your vehicle has dual rear wheels, thread the two element swiveling
lug nuts on the studs with the flange facing toward the wheel.
6. Use the lug nut wrench to screw the lug nut snugly against the wheel.
7. Lower the vehicle by turning the jack handle counterclockwise.
8. Remove the jack and fully tighten the lug nuts in the following
pattern:
²5-lug wheel
1
4 3
2 5
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