2018 Ford F550 Fuse Box Diagram

This article aims to highlight the significance of the 2018 Ford F550 fuse box diagram, providing insights into how to access it and offering guidance on resolving common issues associated with the fuse box.

Identifying the Fuse Types

CALLOUT	FUSE TYPE
A	Micro 2
B	Micro 3
C	Maxi
D	Mini
E	M Case
F	J Case
G	J Case Low Profile

Always replace a fuse with one that has the specified amperage rating. Using a fuse with a higher amperage rating can cause severe wire damage and could start a fire.

2018 Ford F550 Fuse Box Diagram (Power Distribution Box)

The power distribution box on the 2018 F550, located in the engine compartment, is the designated housing for high-current fuses that act as crucial protectors for the primary electrical systems of your vehicle.

These fuses play a pivotal role in safeguarding the systems from overloads, ensuring their smooth operation, and preventing any potential damage from occurring.

WARNING:  Always disconnect the battery before servicing high current fuses.    WARNING:  To reduce risk of electrical shock, always replace the cover to the power distribution box before reconnecting the battery or refilling fluid reservoirs.

¹Micro fuse. ²M case fuse. ³J case fuse.

Fuse or Relay Number	Fuse Rating	Protected Components
1	20A1	Powertrain control module.
2	20A1	Emissions – malfunction indicator lamp.
3	20A1	Cooling fan.   A/C compressor.   Engine brake.
4	20A1	Noise suppression cap.   Mass air flow sensor.   Emissions.   Glow plugs.   Urea.
5	15A1	Compressed natural gas fuel control module.   Fuel sensor.
6	—	Not used.
7	—	Not used.
8	—	Not used.
9	—	Not used.
10	15A1	Heated exterior mirrors.
11	—	Compressed natural gas relay.
12	40A2	Heated rear window.
13	—	Not used.
14	—	Powertrain control module relay.
15	20A1	Horn.
16	10A1	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	30A2	Trailer tow battery charge relay (if equipped).
28	—	Not used.
29	—	Run-start relay.
30	10A1	4×4 module.
31	5A1	Adaptive cruise control.   Run-start.
32	5A1	Anti-lock brake system module.   Run-start.
33	10A1	Powertrain control module – ignition status power run.   Run-start.   Engine control module.   Transmission control module.
34	10A1	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	25A2	Glow plugs.
42	40A2	Trailer tow lighting module (if equipped).
43	40A2	Front blower motor.
44	50A3	Voltage quality.   Body control module power.
45	60A3	Active front steering.
46	50A3	Supplemental air heater bank #2.
47	50A3	Cooling fan.   Supplemental air heater bank #3.
48	50A3	Body control module run power 1 bus.
49	60A3	Inverter.
50	50A3	Body control module run power 2 bus.
51	60A3	Body control module B+ feed.
52	60A3	Anti-lock brake system pump.
53	50A3	Supplemental air heater bank #1.
54	30A3	Trailer brake control module.
55	30A3	Climate controlled seat module.
56	40A3	Auxiliary lighting module.
57	30A2	Power running boards.
58	30A2	Compressed natural gas fuel control module relay.
59	30A2	Anti-lock brake system valve.
60	—	Not used.
61	30A2	Driver power seat.
62	20A2	Auxiliary power point #1 (instrument panel).
63	30A2	Starter motor.
64	20A2	Auxiliary power point #2.
65	30A2	Trailer tow lighting module (if equipped).
66	20A2	Auxiliary power point #3 (center console).
67	30A2	Passenger power seat.
68	20A2	Auxiliary power point #4 (USB charger, rear center console).
69	25A2	4×4 module.
70	20A2	Auxiliary power point #5 (rear center console).
71	—	Not used.
72	30A2	Trailer tow left hand/right hand stop/turn (if equipped, not present with trailer brake controller).
73	—	Not used.
74	—	Not used.
75	30A2	Fuel pump.
76	—	Not used.
77	30A2	Wiper motor.
78	—	Not used.
79	30A2	Power sliding rear window.
80	25A1	4×4 module.
81	10A1	4×4 solenoid.
82	10A1	Power telescoping mirrors.
83	20A1	Rear heated seats.
84	10A1	Trailer tow backup lamps (if equipped).
85	—	Not used.
86	—	Not used.
87	—	Not used.
88	10A1	Multi contour seats.
89	—	Not used.
90	10A1	Spot light module.
91	10A1	Upfitter interface module.
92	—	Not used.
93	—	Not used.
94	15A1	Transmission control module.
95	10A1	Powertrain control module keep alive power.
96	5A1	Rain sensor.
97	10A1	Run/Start control for Auxiliary power point #5
98	10A 1	Alternator sense.
99	30A 1	Trailer tow parking lamps.

Passenger Compartment Fuel Panel

The passenger compartment fuse panel is conveniently located on the right-hand side of the passenger footwell, hidden behind a trim panel.

To access the fuse panel, simply pull the trim panel towards you and swing it away from the side.

When reattaching the trim panel, align the tabs with the grooves on the panel and firmly push it to securely close it. This user-friendly process makes it easy to remove and reinstall the trim panel, providing convenient access to the passenger compartment fuse panel.

Note:   It may be easier to access the fuse panel if you remove the finish trim piece.

⁴Micro 2 fuse. ⁵Micro 3 fuse. ⁶Circuit breaker.

Fuse or Relay Number	Fuse Rating	Protected Components
1	—	Not used.
2	7.5A4	Memory seat switch (lumbar power).
3	20A4	Driver door unlock relay.
4	5A4	Aftermarket electronic brake controller.   Trailer brake controller Brake On/Off.   Customer access circuits.
5	—	Not used.
6	—	Not used.
7	—	Not used.
8	10A5	Driver window switch mirror fold.
9	10A5	Brake On/Off / Pressure Switch.
10	—	Not used.
11	5A5	Combined sense security module.
12	7.5A5	Front climate control module.
13	7.5A5	Instrument cluster.   Smart data link.   Steering column control module.
14	10A5	Extended power restraints module.
15	10A5	Smart datalink connector power.
16	15A4	Tailgate release solenoid.
17	5A5	Head-up display.
18	5A5	Push button ignition switch.   Ignition switch.   Key inhibit.
19	7.5A5	Transmission control switch (tow/haul).   Select Shift switch.
20	7.5A5	Active front steering module.
21	5A5	Head-up display.   Humidity sensor.
22	5A5	Upfitter switch.   Run/Start.   PTO relays.
23	10A4	Accessory delay.   Power windows.   Moonroof.   Power folding mirrors relay.   Inverter.   Window/moonroof switch illumination.
24	20A4	Central locking system relay.
25	30A4	Left-hand front smart window motor.   Door zone module.
26	30A4	Right-hand front smart window motor.   Door zone module.
27	30A4	Moonroof.
28	20A4	Sony amplifier – 10 channel.
29	—	Not used.
30	—	Not used.
31	15A4	Adjustable pedals switch.
32	10A4	SYNC.   GPS module.   Display.   Radio frequency receiver.
33	20A4	Radio.
34	30A4	Run-start relay.
35	5A4	Extended power restraints module.
36	15A4	Lane keeping system.   Automatic high beam control.   Auto-dimming mirrors.   Rear heated seats.   Camera module.
37	20A4	Heated steering wheel.
38	30A6	Rear power window switch.