2021 Ford F-550 Fuse Box Diagram

Engine Compartment Fuse Box

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.

The engine compartment fuse box is in the engine compartment. It has high-current fuses that protect your vehicle’s main electrical systems from overloads.If you disconnect and reconnect the battery, you need to reset some features.

Fuse Number	Fuse Rating	Protected Component
1	20 A	Power point 4.
2	20 A	Power point 3.
3	10 A	Spot light module.
4	10 A	Four-wheel drive vacuum solenoid.
5	40 A	Active front steering.
6	10 A	Snow plow.
7	30 A	Trailer tow battery charge.
8	10 A	Anti-lock brake system module.
9	10 A	Electronic power assisted steering module.
10	30 A	Trailer tow park lamps.
11	20 A	Horn.
12	30 A	Torque overlay.
13	30 A	Power sliding rear window.
14	40 A	Body control module – battery power in feed 1.
15	30 A	Passenger seat power.
16	10 A	Powertrain control module.   Transmission control module.
17	10 A	Blind spot information system.
18	10 A	Four-wheel drive module.
19	5 A	Adaptive cruise control.
20	15 A	Heated mirrors.
21	40 A	Heated rear window.
22	10 A	On-board diagnostic module.   Smart data link connector.
23	15 A	Transmission control module.
24	30 A	Driver power seat.
25	25 A	Voltage quality module.
26	30 A	Trailer tow battery charge.
27	20 A	Rear heated seats.
28	25 A	Glow plug (diesel).
—	Not used (gas).
29	40 A	Electric power assisted steering motor.
30	10 A	Not used (spare).
31	20 A	Power point 5.
32	25 A	Four-wheel drive module.
33	10 A	Alternator sense line 2.
34	50 A	Electric cooling fan (gas).   Supplemental air heater (diesel).
35	20 A	Power point 2.
36	20 A	Power point 1.
37	60 A	Anti-lock brake system pump.
38	60 A	Inverter.
39	25 A	Four-wheel drive module.
40	30 A	Starter motor solenoid.
41	10 A	Tailgate release solenoid.
42	40 A	Blower motor.
43	10 A	Trailer tow backup lamps.
44	40 A	Trailer tow lighting module.
45	30 A	Anti-lock brake system valve.
46	30 A	Compressed natural gas module power.
47	50 A	Supplemental air heater (diesel).
—	Not used (gas).
48	50 A	Supplemental air heater (diesel).
—	Not used (gas).
49	—	Not used.
50	30 A	Heated and cooled seats.
51	20 A	Powertrain control module.
52	15 A	Compressed natural gas (gas).   Fuel rail pressure relief control (diesel).
53	20 A	Exhaust gas recirculation stepper motor (gas).   Universal exhaust gas oxygen sensors (gas).   Exhaust gas recirculation cooler bypass (diesel).   Urea pump motor controller (diesel).   Oxygen sensors.
54	20 A	A/C clutch relay power.   Fan clutch.
55	5 A	Rain sensor.
56	30 A	Windshield wipers.
57	10 A	Upfitter interface module.
58	10 A	Alternator sense line.
59	30 A	Power running boards.
60	40 A	Body control module – battery power in feed 2.
61	10 A	Telescopic mirror motors.
62	40 A	Trailer brake control.   Aftermarket e-brake access.
63	15 A	Multi-contour seats.
64	20 A	Ignition coil (gas).   Glow plug module (diesel).   Nitrogen oxide module (diesel).   Urea level and quality sensor (diesel).
65	30 A	Fuel pump.
66	10 A	A/C clutch solenoid.
67	40 A	Auxiliary lighting module.
68	10 A	Powertrain control module.
69	60 A	Body control module power.
70	30 A	Trailer tow stop and turn lamps.

Note:   Spare fuse amperage may vary.

Passenger Compartment Fuse Panel

The fuse panel is in the right-hand side of the passenger footwell behind a trim panel. To remove the trim panel, pull it toward you and swing it away from the side. To reinstall it, line up the tabs with the grooves on the panel, and then push it shut.

Note:   It may be easier to access the fuse panel if you remove the finish trim piece.Replace fuses with the same type and rating. 

Fuse Number	Fuse Rating	Protected Component
1	—	Not used.
2	10 A	Driver door pack switch.   Power sliding rear window switch.
3	7.5 A	Seat memory switch.   Power lumbar motor.   Wireless charging module.
4	20 A	Not used (spare).
5	—	Not used.
6	10 A	Power telescoping mirrors switch.   Front power windows switch.
7	10 A	Brake on-off switch.
8	5 A	Embedded modem.
9	5 A	Combined sensor module.
10	—	Not used.
11	—	Not used.
12	7.5 A	On-board diagnostic module.   Smart data link connector.   Climate control module.
13	7.5 A	Steering column control module.   Instrument cluster.
14	15 A	Not used.
15	15 A	SYNC.   Display.
16	—	Not used.
17	7.5 A	Active front steering module.   Park aid module.
18	7.5 A	Selectable drive modes switch.   Select shift switch.
19	5 A	Head up display.
20	5 A	Ignition switch.   Key inhibit solenoid.
21	5 A	Head up display.   In-vehicle temperature and humidity sensor.
22	5 A	Upfitter switches.
23	30 A	Driver front door module.
24	30 A	Moonroof.
25	20 A	Not used (spare).
26	30 A	Passenger front door module.
27	30 A	Not used (spare).
28	30 A	Amplifier.
29	15 A	Adjustable pedals switch.
30	5 A	Brake on-off output to trailer brake controller and customer access circuits.
31	10 A	Remote keyless entry.
32	20 A	Radio.
33	—	Not used.
34	30 A	Run/start relay.
35	5 A	Not used (spare).
36	15 A	Camera module.   Lane keeping system.   Auto-dimming interior mirror.   Rear heated seats.
37	20 A	Heated steering wheel.
38	30 A Circuit Breaker	Power windows.

Note:   Spare fuse amperage may vary.

2021 Ford F-550 Owners Manual

Changing a Fuse

Fuses

WARNING:  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.

If electrical components in the vehicle are not working, a fuse may have blown. Blown fuses are identified by a broken wire within the fuse. Check the appropriate fuses before replacing any electrical components.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