In this article, we’ll provide a detailed overview of the 1999 Ford F550 fuse box diagram, explaining the purpose of each fuse and guiding you through the layout for a better understanding of how they work.
Let’s start with the importance of Fuse Box, and Diagram.
Table of Contents
Standard fuse amperage rating and color
| COLOR | |||||
| Fuse Rating | Mini Fuses | StandardFuses | Maxi Fuses | CartridgeMaxiFuses | Fuse LinkCartridge |
| 2A | Grey | Grey | — | — | — |
| 3A | Violet | Violet | — | — | — |
| 4A | Pink | Pink | — | — | — |
| 5A | Tan | Tan | — | — | — |
| 7.5A | Brown | Brown | — | — | — |
| 10A | Red | Red | — | — | — |
| 15A | Blue | Blue | — | — | — |
| 20A | Yellow | Yellow | Yellow | Blue | Blue |
| 25A | Natural | Natural | — | — | — |
| 30A | Green | Green | Green | Pink | Pink |
| 40A | — | — | Orange | Green | Green |
| 50A | — | — | Red | Red | Red |
| 60A | — | — | Blue | — | Yellow |
| 70A | — | — | Tan | — | Brown |
| 80A | — | — | Natural | — | Black |
1999 Ford F550 Fuse Box Diagram (Power Distribution Box)
In the engine compartment, close to the brake master cylinder, you’ll find the power distribution box, trailer tow, and electronic shift-on-the-fly relay blocks. These important components are responsible for managing and controlling various electrical systems in your vehicle.
The power distribution box is equipped with high-current fuses that are specifically designed to protect the main electrical systems of your vehicle from potential overloads. These fuses act as protective barriers, shielding sensitive electrical components from any damage.
- Inside the vehicle, pull the hood release handle located under the bottom left corner of the instrument panel.
- Go to the front of the vehicle and release the auxiliary latch located under the right center of the hood.
Slide the handle to release the auxiliary latch. - Lift the hood until the lift cylinders hold it open.
| Fuse/Relay Location | Fuse AmpRating | 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 PumpRelay Coil, Fuel Pump Relay Coil, Mass AirFlow Sensor, Fuel InjectorsDiesel only-Dual Alternator A Field |
| 6 | -(Gasoline only)10A*(Diesel only) | Gasoline only-Not UsedDiesel only-Single or Dual Alternator AField, Regulator |
| 7 | 20A*(Gasoline only)5A* (Diesel only) | Trailer Tow Electronic Brake Illumination, Park Lamps, Trailer Tow Park Lamp RelayCoil |
| 8 | 15A* | Trailer Tow Electronic Brake Illumination,Park Lamps, Trailer Tow Park Lamp RelayCoil |
| 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 KeylessEntry-Driver Door Unlock Relay Coil, AllDoor Unlock Relay Coil, All Door Lock Relay Coil, Park Lamp Flash Relay, If not equipped with Remote Keyless Entry-Power Door Lock Motors |
| 27 | -(Gasoline only)30A*(Diesel only) | Gasoline only-Not UsedDiesel 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 | ||
1999 Ford F550 Passenger Compartment Fuse Panel Diagram
The passenger compartment fuse panel is located below and to the left of the steering wheel, near the brake pedal of your 1999 Ford F550. To access the fuses, just remove the panel cover.
To remove the cover of the fuse panel, turn the panel fasteners counterclockwise.
When removing a fuse, use the fuse puller tool provided on the cover of the fuse panel.
| Fuse/Relay Location | Fuse AmpRating | Description |
| 1 | 20A | Electronic Flasher |
| 2 | 5A | Instrument Cluster, Powertrain Control Module (PCM) Keep Alive Memory |
| 3 | 20A | Cigar Lighter, OBDII |
| 4 | 10A | Glove Box Lamp, Map Lamps, Power Mirrors, Underhood Lamp |
| 5 | — | Not Used |
| 6 | — | Not Used |
| 7 | 5A | Power Window Lock Switch Illumination |
| 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 | Auxiliary Powertrain Control Module(APCM) (Diesel only), Instrument Cluster, GEM Module, Overdrive Cancel Switch, IdleValidation Switch (Diesel only), Overhead Console |
| 16 | 15A | Instrument Cluster, Hi-beam Headlamps |
| 17 | — | Not Used |
| 18 | — | Not Used |
| 19 | 10A | Washer Pump, Wiper Run/Park Relay Coil, Wiper Hi/LO Relay Coil, Washer Pump Relay Coil |
| 20 | 15A | Starter Motor Relay Coil, PCM (Gasoline only) |
| 21 | — | Not Used |
| 22 | 10A | Air Bag Module, Passenger Air BagActivation 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 |
| 27 | 10A | Ignition Run Power Feed (Customer Access) |
| 28 | 10A | Generic Electronic Module (GEM), Powertrain Control Module (PCM),Anti-lock Brake System (ABS) Module,Brake Shift Interlock, Speed Control |
| 29 | 5A | Instrument Cluster (Charge and Airbag Warning Lamps) |
| 30 | 30A | 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 |
| 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 |
Tom Smith is a passionate car mechanic and automotive enthusiast, specializing in the intricate world of car fuse boxes. With years of hands-on experience under the hood, he has earned a reputation as a reliable expert in his field. As the founder and content creator of the popular blog website 'carsfuse.com,' Tom has dedicated himself to sharing his extensive knowledge of car fuse boxes and electrical systems with the world.