Ford F-250 Super Duty (1999 year). Manual — part 38

Fuse/Relay

Location

Fuse Amp

Rating

Description

27

10A

Ignition Run Power Feed (Customer
Access)

28

10A

Brake Shift Interlock, DRL Relay Coil,
Speed Control Module, Backup Lamps,
Trailer Tow Backup Lamp Relay Coil,
Electronic Shift On The Fly Hub Lock
Solenoid

29

5A

Instrument Cluster (Charge and Airbag
Warning Lamps)

30

30A

PCM Relay Coil, Ignition Coil (Gasoline
only), Fuel Heater (Diesel only), Wastegate
Solenoid (Diesel only), Injector Driver
Module Relay Coil (Diesel only)

31

—

Not Used

Relay 1

—

Interior Lamp Relay

Relay 2

—

Not Used

Relay 3

—

Horn

Relay 4

—

Power Window One Touch Down Relay

Relay 5

—

Accessory Delay Relay

Power distribution box

The power distribution box, trailer tow and electronic shift on the fly
relay blocks are located in the engine compartment near the brake
master cylinder.

The power distribution box contains high-current fuses that protect your
vehicle’s main electrical systems from overloads.

Always disconnect the battery before servicing high current
fuses.

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
Battery section of the Maintenance and Care chapter.

Roadside emergencies

149

The high-current fuses and relays are coded as follows.

Fuse/Relay

Location

Fuse Amp

Rating

Description

1

7.5A *

Trailer Tow Left Stop/Turn Lamp

2

10A*

Air Bag Module

3

7.5A*

Trailer Tow Right Stop/Turn Lamp

4

20A*

Trailer Tow Backup Lamps, Trailer Tow
Park Lamps

5

20A*

(Gasoline

only)

5A* (Diesel

only)

Gasoline only-PCM, Two Speed Fuel Pump
Relay Coil, Fuel Pump Relay Coil, Mass Air
Flow Sensor, Fuel Injectors
Diesel only-Dual Alternator

⬙A⬙ Field

6

-

(Gasoline

only)

10A*(Diesel

only)

Gasoline only-Not Used
Diesel only-Single or Dual Alternator

⬙A⬙

Field, Regulator

19

29

18

28

30

31

32

33

34

35

37

36

17

27

16

26

15

25

14

24

13

11

12

91

0

78

56

34

12

23

22

21

20

Roadside emergencies

150

Fuse/Relay

Location

Fuse Amp

Rating

Description

7

20A*

(Gasoline

only)

5A* (Diesel

only)

Gasoline only-Vapor Managment Valve,
HEGO Sensors, Intake Manifold
Communication Control, EVR Solenoid,
PCM, Canister Vent Solenoid
Diesel only-Dual Alternator

⬙A⬙ Field

8

15A*

Trailer Tow Electronic Brake Illumination,
Park Lamps, Trailer Tow Park Lamp Relay
Coil

9

10A*

Left Headlamp

10

25A*

Power Point

11

10A*

Right Headlamp (Low Beam)

12

10A*

Daytime Running Lamps (DRL) Resistor

13

30A**

Multi-function Switch, Headlamps

14

60A**

Anti-Lock Brake System

15

30A**

Windshield Wiper Motor

16

30A**

Trailer Tow Battery Charge

17

30A**

Electronic Shift On The Fly Relay, Transfer
Case Shift Motor

18

30A**

Power Seat

19

20A**

Fuel Pump Motor, PCM

20

50A**

Ignition Switch (B4 & B5)

21

50A**

Ignition Switch (B1 & B3)

22

50A**

Instrument Panel Junction Box

23

40A**

Blower Motor

24

30A**

Power Distribution Box

25

30A***

Power Windows

26

20A**

If equipped with Remote Keyless
Entry-Driver Door Unlock Relay Coil, All
Door Unlock Relay Coil, All Door Lock
Relay Coil, Park Lamp Flash Relay, If not
equipped with Remote Keyless
Entry-Power Door Lock Motors

Roadside emergencies

151

Fuse/Relay

Location

Fuse Amp

Rating

Description

27

-

(Gasoline

only)

30A*

(Diesel

only)

Gasoline only-Not Used
Diesel only-Injector Driver Module

28

30A**

Trailer Tow Electronic Brake Controller

29

20A**

Radio

30

--

PCM Power Relay

31

--

Blower Motor Relay

32

--

Two Speed Fuel Pump Relay (Gasoline
only), Injector Driver Module Power Relay
(Diesel only)

33

--

Washer Pump Relay

34

--

Windshield Wiper Park/Run Relay

35

--

Windshield Wiper HI/LO Relay

36

--

Not Used

37

--

PCM Relay Diode

38

--

Trailer Tow Backup Lamp Relay

39

--

Trailer Tow Battery Charge Relay

40

--

Electronic Shift On The Fly Relay #1,
Electronic Shift On The Fly Relay #2

* Mini Fuses ** Maxi Fuses ***Circuit Breaker

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

Your vehicle may be equipped with a spare tire that can be used as
either a spare or a regular tire. The spare tire is not equipped with wheel
trim. The wheel trim from the original wheel/tire may be used on the
spare.

Roadside emergencies

152