2021 Ford F-750 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	Horn.
2	40 A	Blower motor.   Blower motor control.
3	—	Not used.
4	30 A	Starter motor.
5	—	Not used.
6	20 A	Upfitter relay 4.
8	—	Not used.
10	—	Not used.
12	—	Not used.
13	10 A	Run/start spare.
14	10 A	Adaptive cruise control.
15	10 A	Blower motor relay.
16	20 A	Air dryer.
17	10 A	Powertrain control module – ignition status run power.   Glow plug control module – ignition status run power (diesel).
18	10 A	Anti-lock brake system run/start.
19	10 A	Transmission control module.   Ignition status run power (diesel).
20	30 A	Windshield wiper motor.
21	—	Not used.
22	—	Not used.
23	10 A	Alternator 2 (dual alternator only).
24	40 A	Body control module run power 2 bus.
25	50 A	Body control module run power 1 bus.
26	—	Not used.
27	20 A	Body builder battery feed.
28	—	Not used.
29	10 A	Alternator 1 A-Line.
30	—	Not used.
31	60 A	Hydromax pump.
32	20 A	Powertrain control module.
33	20 A	Canister vent solenoid (gas).   Canister purge solenoid (gas).   Variable cam timing actuator 11 (gas).   Heated exhaust gas oxygen sensor (gas).   Urea tank power (diesel).   Exhaust gas recirculation cool bypass valve (diesel).
34	10 A	A/C clutch relay.   Customer access vehicle power 3 feed.   Variable oil pump (diesel).   Cooling fan (diesel).   Fan clutch (gas).   Exhaust brake (diesel).
35	20 A	Coil on plug (gas)   Urea tank (diesel).   Glow plug controller (diesel).   Nitrogen oxide sensor control module (diesel).   Particulate matter sensor (diesel).
36	10 A	Fuel volume control value (diesel).   Fuel pressure regulator (diesel).
37	—	Not used.
38	—	Not used.
39	—	Not used.
41	30 A	Trailer brake control module.
43	—	Not used.
45	—	Not used.
46	10 A	A/C clutch solenoid.
47	40 A	Upfitter relay 1.
48	20 A	Upfitter run and accessory feed.
49	30 A	Pump electronics module (gas).   Fuel pump (diesel).
50	15 A	Injector power (gas).
51	20 A	Power point #1.
52	—	Not used.
53	30 A	Trailer tow park lamp.
54	—	Not used.
55	20 A	Upfitter relay 3.
56	—	Not used.
58	5 A	USB power.
59	10 A	U-Haul parking lamps (gas).
60	10 A	Dual fuel tank selector switch (diesel).
61	—	Not used.
62	—	Not used.
63	20 A	Driver seat compressor.
64	20 A	Passenger seat compressor.
65	—	Not used.
66	10 A	Four pack solenoid differential lock.
67	10 A	Hydromax relay power.
69	—	Not used.
70	40 A	Inverter.
71	30 A	Anti-lock brake system valves.
72	10 A	Brake on-off switch (hydraulic brakes).   Stop lamp air pressure switch 1 and 2 (air brakes).
73	—	Not used.
74	15 A	Heated mirror.
75	—	Not used.
76	60 A	Body control module battery feed.
77	30 A	Body control module voltage quality monitor power feed.
78	10 A	Transmission module (diesel).
79	5 A	Hydromax pump monitor.
80	10 A	Trailer tow backup signal.
81	—	Not used.
82	5 A	Upfitter switch (factory location for ignition power).
83	5 A	Upfitter switch (optional location for power at all times).
84	—	Not used.
85	—	Not used.
86	—	Not used.
87	—	Not used.
88	10 A	Cargo lamps.
89	—	Not used.
91	—	Not used.
93	—	Not used.
94	—	Not used.
95	20 A	Stop lamps.   Trailer tow stop lamps.
96	—	Not used.
97	—	Not used.
98	30 A	Trailer tow battery charge.
99	40 A	Upfitter relay 2.
100	25 A	Glow plug controller (diesel).
101	—	Not used.
102	—	Not used.
103	—	Not used.
104	—	Not used.
105	15 A	Trailer tow stop and turn relay.

Note:   Spare fuse amperage may vary.

Relay Number	Fuse Rating	Protected Component
R02	—	Not used.
R05	—	Not used.

Passenger Compartment Fuse Box

The fuse panel is in the passenger footwell. Remove the panel cover to access the fuses.Pull the fuse panel cover toward you to remove it. When the clips of the panel disengage, let the panel fall easily. Use the provided fuse puller tool to remove a fuse. It is on the fuse panel cover.Replace fuses with the same type and rating. See  Changing a Fuse .

Fuse Number	Fuse Rating	Protected Component
1	—	Not used.
2	10 A	Right-hand and left-hand front door lock switch.   Telescopic mirror switch.   Right-hand and left-hand front window switch (two window units).   Right-hand and left-hand front window motor.   Inverter.
3	7.5 A	Power mirror switch.
4	20 A	Ancillary translator module.
5	—	Not used.
6	—	Not used.
7	10 A	Smart data link connector power.   Air brake diagnostic connector.
8	—	Not used.
9	—	Not used.
10	—	Not used.
11	—	Not used.
12	7.5 A	Smart data link connector.   Enterprise wired-in-device.
13	7.5 A	Cluster.   Steering column control module.
14	—	Not used.
15	15 A	Climate control module.
16	—	Not used.
17	—	Not used.
18	7.5 A	Yaw sensor.   Electronic stability control and non-electric stability control.
19	—	Not used.
20	5 A	Ignition switch.
21	5 A	Not used (spare).
22	—	Not used.
23	30 A	Left-hand front window motor.
24	—	Not used.
25	—	Not used.
26	30 A	Right-hand front motor window.
27	—	Not used.
28	—	Not used.
29	15 A	Relay folding mirror.
30	5 A	Brake signal for air brake.   Customer access stop lamp signal.   Brake on-off isolation relay.   Trailer tow stop lamp relay.
31	10 A	Upfitter interface module.   Remote radio frequency receiver.
32	20 A	Radio.
33	—	Not used.
34	—	Not used.
35	5 A	Tow haul switch.
36	15 A	Lane departure warning camera.
37	—	Not used.
38	30 A	Left-hand front power window switch (four window units).

Note:   Spare fuse amperage may vary.

2021 Ford F-750 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

AMicro 2. BMicro 3. CMaxi. DMini. EM Case. FJ Case. GJ Case Low Profile. HSlotted M Case.