What is a car fuse box and where is it located?

A car fuse box is an electrical distribution center that houses fuses and relays protecting your vehicle's electrical circuits. Most vehicles have multiple fuse boxes: the main box is typically located under the hood near the engine, while the interior panel is usually under the dashboard on the driver's side or beneath the steering wheel. Consult your owner's manual or our fuse diagrams to find the exact location for your specific make and model. Knowing your fuse box location is essential for troubleshooting electrical problems and performing maintenance.

How do I read a fuse box diagram?

Fuse box diagrams show the location and amperage rating of each fuse and relay. Each position is numbered and labeled with the circuit it protects (headlights, wipers, power windows, etc.) and the fuse's amperage rating (5A, 10A, 15A, 20A, etc.). The diagram indicates whether positions contain fuses or relays. Color-coded fuses help identify amperage: blue for 15A, yellow for 20A, red for 10A, and brown for 7.5A. Our detailed diagrams include this information for every vehicle, making it easy to identify the correct fuse for any circuit.

What does an amperage rating mean on a fuse?

A fuse's amperage rating indicates how much electrical current it can safely handle before blowing. Common ratings include 5A, 7.5A, 10A, 15A, 20A, 25A, 30A, and 40A. Higher-amperage fuses protect circuits with greater power demands like the alternator or starter motor. Lower ratings protect sensitive circuits like dashboard lights or power windows. Never use a fuse with a higher amperage rating than specified, as this can allow excessive current through the circuit, creating fire hazards and damaging electrical components. Always replace blown fuses with the exact amperage specified in your vehicle's diagram.

Why does my fuse keep blowing?

A repeatedly blown fuse indicates an underlying electrical problem requiring investigation. Common causes include short circuits in wiring, failing electrical components, water damage in connectors, or improper installation of aftermarket equipment. Never simply replace the fuse multiple times without addressing the root cause. Start by checking the affected circuit for loose connections, damaged wiring, or burned components. If the problem persists, consult a professional mechanic. Our fuse box diagrams help you identify which circuit is problematic, allowing you to pinpoint the issue quickly and prevent vehicle damage or fire hazards.

How do I safely replace a blown fuse?

To safely replace a blown fuse: (1) Turn off the engine and all electrical systems. (2) Locate the fuse box using our diagram. (3) Find the blown fuse by examining the filament inside—a blown fuse appears darkened or broken. (4) Note the amperage rating on the fuse. (5) Remove the blown fuse using the provided fuse puller tool or carefully with your fingers. (6) Insert a new fuse with the exact same amperage rating. (7) Start the engine to verify the circuit works. If the replacement fuse blows immediately, don't replace it again—seek professional service. Our detailed diagrams ensure you find the correct fuse position quickly.

What's the difference between a fuse and a relay?

Fuses are passive protection devices that melt and break the circuit when current exceeds safe levels, preventing damage and fire. Relays are electromagnetic switches that control high-power circuits using low-power signals from switches. Fuses protect circuits from overcurrent, while relays switch circuits on and off or redirect power. Fuse boxes contain both components, and our diagrams identify which positions contain fuses and which contain relays. Understanding this distinction helps you troubleshoot problems: a blown fuse indicates overcurrent issues, while a relay failure causes the circuit to not respond to control switches.

Where can I find the fuse diagram for my specific vehicle?

ProCarManuals provides comprehensive fuse box diagrams for thousands of vehicle makes and models organized by year. Use our search feature to find your specific vehicle by make, model, and year. We cover Acura, Honda, Toyota, Ford, Chevrolet, BMW, Mercedes, Audi, and many other manufacturers. Each diagram shows the fuse box location, circuit labels, amperage ratings, and detailed explanations. Our guides help you quickly locate the fuse you need, understand circuit functions, and troubleshoot electrical problems. If you can't find your vehicle, contact our support team for assistance.

What electrical problems can I diagnose with a fuse diagram?

Fuse diagrams help diagnose non-functioning circuits by showing which fuse protects which system. If your headlights don't work, find the headlight fuse position in the diagram and check if it's blown. Same for power windows, wipers, interior lights, power seats, and other electrical features. A blown fuse indicates an overcurrent condition in that circuit. Non-blown fuses with non-functioning components suggest relay failure, wiring problems, or failed switches. Our detailed diagrams identify circuit names and their locations, allowing you to systematically troubleshoot electrical issues before seeking expensive professional service. Replace blown fuses with correct amperage ratings and investigate repeated failures.

Are fuse boxes the same in all model years of the same vehicle?

Fuse box layouts often change between model years, even for the same vehicle make and model. Engine updates, added safety features, new electrical systems, and design revisions cause manufacturers to modify fuse configurations. A 2020 Honda Civic may have a different fuse box layout than a 2015 Civic. ProCarManuals provides separate diagrams for each model year to ensure accuracy. Always consult the diagram for your specific year to find the correct fuse positions. Incorrect fuse selection from a different year could damage circuits or create safety hazards. Our organized, year-specific diagrams prevent these mistakes.

What should I do if my vehicle has multiple fuse boxes?

Most vehicles have at least two fuse boxes: the main underhood panel near the engine and an interior panel under the dashboard. Some vehicles have additional fuse boxes in the rear, under seats, or in other locations. Our comprehensive diagrams identify every fuse box location in your vehicle and provide separate diagrams for each one. The underhood box typically protects engine-related circuits (fan, fuel pump, ignition), while the interior box protects comfort and convenience features (windows, lights, wipers, seats). Identifying which fuse box contains the circuit you need prevents wasting time searching. Always consult all relevant diagrams when troubleshooting electrical problems in multi-box systems.

Can I use a higher amperage fuse to prevent future blown fuses?

Never use a fuse with higher amperage than specified. Doing so creates serious safety risks. Higher-amperage fuses allow excessive current through circuits designed for lower power, causing wire overheating, component damage, and potential fires. If a fuse blows, it indicates the circuit is drawing more current than safe, often due to shorts, failing components, or improper modifications. Installing a higher-amperage fuse masks the problem rather than solving it. Always replace fuses with the exact amperage rating shown in your vehicle's fuse diagram. If a replacement fuse blows immediately, investigate the underlying electrical fault. Professional diagnosis prevents damage and ensures vehicle safety.

Ford F-550, Ford F-450, Ford F-250, Car Fuse Box, Ford

Ford F250 / F350 / F450 / F550 2017-2019 Fuse Box Diagram – Location, Fuses & Relay Assignments

By Todd Mitchell

On: Saturday, September 6, 2025 2:04 AM

ford f250 f350 f450 f550 2017 2019 fuse layout

In this article we look at the fourth generation Ford F-Series Super Duty, available from 2017 to 2019. Here you will find the 2017, 2018 and 2019 Ford F-250 / F-350 / F-450 / F-550 fuse box diagrams, get information on the location of the fuse boxes inside the vehicle and learn about the assignment of each fuse (fuse layout) and relay.

The fuses for the cigar lighter socket in the Ford F-250 / F-350 / F-450 / F-550 are fuses №22 (2017: Auxiliary outlet #5 (rear console)), №62 (Auxiliary outlet #1 (instrument panel)), №64 (Auxiliary outlet #2), №66 (Auxiliary outlet #3 (centre console)), №68 (Auxiliary outlet #4 (rear media tray)) and №70 (2018-2019: Auxiliary outlet #5 (rear centre console)) in the engine compartment fuse box.

Fuse box location

Passenger compartment

The fuse panel is in the right-hand side of the passenger footwell behind a trim panel.

ford f250 f350 f450 f550 2017 2019 fuse layout 1 2024 12 05 15 41 51

Engine compartment

The power distribution box is located in the engine compartment.

ford f250 f350 f450 f550 2017 2019 fuse layout 2 2024 12 05 15 42 03

Fuse box diagrams

2017

Passenger compartment

Assignment of the fuses in the Passenger compartment (2017)

№	Amp Rating	Protected components
1	—	Not used.
2	7.5A	Memory seat switch (lumbar power).
3	20A	Driver door unlock relay.
4	5A	Aftermarket electronic brake controller.
5	20A	Rear heated seat module.
6	—	Not used.
7	—	Not used.
8	—	Not used.
9	—	Not used.
10	5A	Securicode™ keyless entry keypad.
11	5A	Rear climate control module.
12	7.5A	Front climate control module.
13	7.5A	Instrument cluster. Smart data link. Steering column control module.
14	—	Not used.
15	10A	Smart datalink connector power. Heads up display.
16	—	Not used.
17	5A	Electronic finish panel.
18	5A	Push button ignition switch. Ignition switch. Key inhibit.
19	7.5 A	Transmission control switch (tow/haul).
20	—	Not used.
21	5A	Terrain management system. Head-up display. Humidity sensor.
22	5A	Occupant classification sensor.
23	10A	Accessory delay. Power windows. Moonroof. Power folding mirrors relay. Inverter. Window/moonroof switch illumination.
24	20A	Central locking system relay.
25	30A	Left-hand front smart window motor. Door zone module.
26	30A	Right-hand front smart window motor. Door zone module.
27	30A	Moonroof.
28	20A	Sony amplifier -10 channel.
29	30A	Sony amplifier -14 channel.
30	—	Not used.
31	—	Not used.
32	10A	SYNC. GPS module. Display. Radio frequency receiver.
33	20A	Radio.
34	30A	Run-start relay.
35	5A	Restraints control module.
36	15 A	Lane keeping system. Automatic high beam control. Auto-dimming mirrors. Rear heated seats.
37	20A	Heated steering wheel.
38	30A	Left-hand front window motor. Rear power window motors.

Engine compartment

ford f250 f350 f450 f550 2017 2019 fuse layout 5 2024 12 05 15 42 25

Assignment of the fuses in the Power distribution box (2017)

№	Amp Rating	Protected components
1	20A	Powertrain control module.
2	20A	Emissions (MIL).
3	20A	Cooling fan. A/C compressor. Engine brake.
4	20A	Noise suppression cap. Mass air flow sensor. Emissions. Glow plugs. Urea.
5	15A	Compressed natural gas fuel control module.
6	—	Not used.
7	—	Not used.
8	—	Not used.
9	—	Not used.
10	15A	Heated exterior mirrors.
11	—	CNG relay.
12	40A	Heated rear window.
13	—	Not used.
14	—	Powertrain control module relay.
15	20A	Horn.
16	10A	A/C clutch relay power.
17	—	Rear heated window and heated mirrors relay.
18	—	Not used.
19	—	Not used.
20	—	Supplemental air heater bank #1 relay.
21	—	Not used.
22	20A	Auxiliary power point #5 (rear console). Run-start.
23	—	Not used.
24	—	Cooling fan relay. Supplemental air heater bank #3 relay.
25	—	Glow plug module power relay.
26	—	Not used.
27	30A	Trailer tow battery charge relay.
29	—	Run-start relay.
30	10A	4×4 module.
31	5A	Adaptive cruise control. Run-start.
32	5A	Anti-lock brake system module. Run-start.
33	10A	Powertrain control module (ISPR). Run-start. Engine control module. Transmission control module.
34	10A	Blind spot information system. Run-start. Front camera. Rear camera.
35	—	Not used.
36	—	Blower motor relay.
37	—	Trailer tow battery charge relay.
38	—	A/C compressor clutch relay.
39	—	Horn relay.
40	—	Supplemental air heater bank #2 relay.
41	25 A	Glow plugs.
42	40A	Trailer tow lighting module.
43	40A	Front blower motor.
44	50A	Voltage quality module. Body control module.
45	60A	Active front steering.
46	50A	Supplemental air heater bank #2.
47	50A	Cooling fan. Supplemental air heater bank #3.
48	50A	Body control module RP1 bus.
49	60A	Inverter.
50	50A	Body control module RP2 bus.
51	60A	Body control module B+ feed.
52	60A	Anti-lock brake system pump.
53	50A	Supplemental air heater bank #1.
54	30A	Trailer brake control module.
55	30A	Climate controlled seat module.
56	40A	Auxiliary lighting module.
57	30A	Power running boards.
58	30A	Compressed natural gas fuel control module relay.
59	30A	Anti-lock brake system valve.
60	—	Not used.
61	30A	Driver power seat.
62	20A	Auxiliary power point #1 (instrument panel).
63	30A	Starter motor.
64	20A	Auxiliary power point #2.
65	30A	Trailer tow lighting module.
66	20A	Auxiliary power point #3 (center console).
67	30A	Passenger power seat.
68	20A	Auxiliary power point #4 (rear media bin).
69	25 A	4×4 module.
70	—	Not used.
71	—	Not used.
72	30A	Trailer tow left hand/right hand stop/turn.
73	—	Not used.
74	—	Not used.
75	30A	Fuel pump.
76	—	Not used.
77	30A	Wiper motor.
78	—	Not used.
79	30A	Power sliding rear window.
80	25A	4×4 module.
81	10A	4×4 solenoid.
82	10A	Power telescoping mirrors.
83	20A	Rear heated seats.
84	10A	Trailer tow backup lamps.
85	—	Not used.
86	—	Not used.
87	—	Not used.
88	10A	Multi contour seats.
89	—	Not used.
90	10A	Spot light module.
91	10A	Upfitter interface module.
92	—	Not used.
93	—	Not used.
94	15A	Transmission control module.
95	10A	Powertrain control module keep alive power.
96	5A	Rain sensor.
97	—	Not used.
98	10A	Alternator sense.
99	30A	Trailer tow parking lamps.

2018, 2019

Passenger compartment

ford f250 f350 f450 f550 2017 2019 fuse layout 6 2024 12 05 15 42 32

Assignment of the fuses in the Passenger compartment (2018, 2019)

№	Amp Rating	Protected Components
1	—	Not used.
2	7.5A	Memory seat switch (lumbar power).
3	20A	Driver door unlock relay.
4	5A	Aftermarket electronic brake controller. Trailer brake controller Brake On/Off. Customer access circuits.
5	—	Not used.
6	—	Not used.
7	—	Not used.
8	10A	Driver window switch mirror fold.
9	10A	Brake On/Off / Pressure Switch.
10	5A	2018: Not used. 2019: Embedded Modem
11	5A	Combined sense security module.
12	7.5A	Front climate control module.
13	7.5A	Instrument cluster. Smart data link. Steering column control module.
14	10A	Extended power restraints module.
15	10A	Smart datalink connector power.
16	15 A	Tailgate release solenoid.
17	5A	Head-up display.
18	5A	Push button ignition switch. Ignition switch. Key inhibit.
19	75A	Transmission control switch (tow/haul). Select Shift switch.
20	7.5A	Active front steering module.
21	5A	Head-up display. Humidity sensor.
22	5A	Upfitter switch. Run/Start. PTO relays.
23	10A	Accessory delay. Power windows. Moonroof. Power folding mirrors relay. Inverter. Window/moonroof switch illumination.
24	20A	Central locking system relay.
25	30A	Left-hand front smart window motor. Door zone module.
26	30A	Right-hand front smart window motor. Door zone module.
27	30A	Moonroof.
28	20A	2018: Sony amplifier -10 channel. 2019: Not used
29	30A	2018: Not used. 2019: Bang & Olufsen Amplifier
30	—	Not used.
31	15A	Adjustable pedals switch.
32	10A	SYNC. GPS module. Display. Radio frequency receiver.
33	20A	Radio.
34	30A	Run-start relay.
35	5A	Extended power restraints module.
36	15 A	Lane keeping system. Automatic high beam control. Auto-dimming mirrors. Rear heated seats. Camera module.
37	20A	Heated steering wheel.
38	30A	Rear power window switch.

Engine compartment

ford f250 f350 f450 f550 2017 2019 fuse layout 7 2024 12 05 15 42 40 1

Assignment of the fuses in the Power distribution box (2018, 2019)

№	Amp Rating	Protected Components
1	20A	Powertrain control module.
2	20A	Emissions – malfunction indicator lamp.
3	20A	Cooling fan. A/C compressor. Engine brake.
4	20A	Noise suppression cap. Mass air flow sensor. Emissions. Glow plugs. Urea.
5	15 A	Compressed natural gas fuel control module. Fuel sensor.
6	—	Not used.
7	—	Not used.
8	—	Not used.
9	—	Not used.
10	15 A	Heated exterior mirrors.
11	—	Compressed natural gas relay.
12	40	Heated rear window.
13	—	Not used.
14	—	Powertrain control module relay.
15	20A	Horn.
16	10A	A/C clutch relay power.
17	—	Rear heated window and heated mirrors relay.
18	—	Trailer park lamp relay.
19	—	Not used.
20	—	Supplemental air heater bank #1 relay.
21	—	Not used.
22	—	Not used.
23	—	Not used.
24	—	Cooling fan relay. Supplemental air heater bank #3 relay.
25	—	Glow plug module power relay.
26	—	Not used.
27	30A	Trailer tow battery charge relay (if equipped).
28	—	Not used.
29	—	Run-start relay.
30	10A	4×4 module.
31	5A	Adaptive cruise control. Run-start.
32	5A	Anti-lock brake system module. Run-start.
33	10A	Powertrain control module – ignition status power run. Run-start. Engine control module. Transmission control module.
34	10A	Blind spot information system. Run-start. Front camera. Rear camera.
35	—	Not used.
36	—	Blower motor relay.
37	—	Trailer tow battery charge relay (only on non-trailer brake controller vehicles).
38	—	A/C compressor clutch relay.
39	—	Horn relay.
40	—	Supplemental air heater bank #2 relay.
41	25 A	Glow plugs.
42	40A	Trailer tow lighting module (if equipped).
43	40A	Front blower motor.
44	50A	Voltage quality. Body control module power.
45	60A	Active front steering.
46	50A	Supplemental air heater bank #2.
47	50A	Cooling fan. Supplemental air heater bank #3.
48	50A	Body control module run power 1 bus.
49	60A	Inverter.
50	50A	Body control module run power 2 bus.
51	60A	Body control module B+ feed.
52	60A	Anti-lock brake system pump.
53	50A	Supplemental air heater bank #1.
54	30A	Trailer brake control module.
55	30A	Climate controlled seat module.
56	40A	Auxiliary lighting module.
57	30A	Power running boards.
58	30A	Compressed natural gas fuel control module relay.
59	30A	Anti-lock brake system valve.
60	—	Not used.
61	30A	Driver power seat.
62	20A	Auxiliary power point #1 (instrument panel).
63	30A	Starter motor.
64	20A	Auxiliary power point #2.
65	30A	Trailer tow lighting module (if equipped).
66	20A	Auxiliary power point #3 (center console).
67	30A	Passenger power seat.
68	20A	Auxiliary power point #4 (USB charger, rear center console).
69	25A	4×4 module.
70	20A	Auxiliary power point #5 (rear center console).
71	—	Not used.
72	30A	Trailer tow left hand/right hand stop/turn (if equipped, not present with trailer brake controller).
73	—	Not used.
74	—	Not used.
75	30A	Fuel pump.
76	—	Not used.
77	30A	Wiper motor.
78	—	Not used.
79	30A	Power sliding rear window.
80	25A	4×4 module.
81	10A	4×4 solenoid.
82	10A	Power telescoping mirrors.
83	20A	Rear heated seats.
84	10A	Trailer tow backup lamps (if equipped).
85	—	Not used.
86	—	Not used.
87	—	Not used.
88	10A	Multi contour seats.
89	—	Not used.
90	10A	Spot light module.
91	10A	Upfitter interface module.
92	—	Not used.
93	—	Not used.
94	15 A	Transmission control module.
95	10A	Powertrain control module keep alive power.
96	5A	Rain sensor.
97	10A	Run/Start control for Auxiliary power point #5
98	10A	Alternator sense.
99	30A	Trailer tow parking lamps.

Ford F250 / F350 / F450 / F550 2017-2019 Fuse Box Diagram – Location, Fuses & Relay Assignments

Fuse box location

Passenger compartment

Engine compartment

Fuse box diagrams

2017

Passenger compartment

Engine compartment

2018, 2019

Engine compartment

Latest Posts

Buick Encore GX 2020-2022 Fuse Box Diagram – Location, Fuses & Relay Assignments

Audi A6 1997-2004 Fuse Box Diagram – Location, Fuses & Relay Assignments

Chevrolet Colorado 2004-2012 Fuse Box Diagram – Location, Fuses & Relay Assignments

Honda Accord 1998-2002 Fuse Box Diagram – Location, Fuses & Relay Assignments

Holden Caprice WM / Holden Statesman WM 2006-2013 Fuse Box Diagram – Location, Fuses & Relay Assignments

Ford Edge 2011-2014 Fuse Box Diagram – Location, Fuses & Relay Assignments

Car Fuse Box Diagrams & Guides

quick navigation

Ford F250 / F350 / F450 / F550 2017-2019 Fuse Box Diagram – Location, Fuses & Relay Assignments

Fuse box location

Passenger compartment

Engine compartment

Fuse box diagrams

2017

Passenger compartment

Engine compartment

2018, 2019

Engine compartment

Latest Posts

Buick Encore GX 2020-2022 Fuse Box Diagram – Location, Fuses & Relay Assignments

Audi A6 1997-2004 Fuse Box Diagram – Location, Fuses & Relay Assignments

Chevrolet Colorado 2004-2012 Fuse Box Diagram – Location, Fuses & Relay Assignments

Honda Accord 1998-2002 Fuse Box Diagram – Location, Fuses & Relay Assignments

Holden Caprice WM / Holden Statesman WM 2006-2013 Fuse Box Diagram – Location, Fuses & Relay Assignments

Ford Edge 2011-2014 Fuse Box Diagram – Location, Fuses & Relay Assignments

Car Fuse Box Diagrams & Guides

quick navigation

Resources

Quick Links

Follow Us On