F-250 Light Duty (1999 year). Instruction - page 37

Fuse/Relay

Location

Fuse Amp

Rating

Description

8

5A

Radio, Headlamp Switch Illumination

9

Not Used

10

Not Used

11

10A

Washer Pump, Wiper Run/Park Relay Coil,
Wiper Hi/LO Relay Coil, Washer Pump
Relay Coil

12

15A

Horn

13

20A

Stop Lamps, Center High-mount Stop
Lamp, Trailer Tow Stop Lamp

14

10A

Dome Lamp, Cargo Lamp, Courtesy Lamps

15

5A

Generic Electronic Module (GEM),
Powertrain Control Module (PCM),
Anti-lock Brake System (ABS) Module,
Brake Shift Interlock, Speed Control

16

15A

Instrument Cluster, Hi-beam Headlamps

17

Not Used

18

Not Used

19

10A

Auxiliary Powertrain Control Module
(APCM) (Diesel only), Instrument Cluster,
GEM Module, Overdrive Cancel Switch, Idle
Validation Switch (Diesel only), Overhead
Console

20

15A

Starter Motor Relay Coil, PCM (Gasoline
only)

21

Not Used

22

10A

Air Bag Module, Passenger Air Bag
Activation Switch, Blower Motor Relay Coil

23

10A

Electronic Flasher

24

10A

Blend Door Actuator, Trailer Tow Battery
Charge Relay Coil

25

5A

4-Wheel Anti-Lock Brake System (4WABS)
Module

26

Not Used

Roadside emergencies

148

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

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