Ford F-350 2021 Fuse Box Info
Fuse box location:
The fuse box is in the right-hand side of the passenger footwell behind a trim panel.
Engine compartment fuse box:
Fuse Box Diagram | Layout
Passenger compartment fuse box:
| Fuse/Relay N° | Rating | Functions |
| 1 | - | Not used |
| 2 | 10A | Driver door pack switch, Power sliding rear window switch |
| 3 | 7.5A | Seat memory switch, Power lumbar motor, Wireless charging module |
| 4 | 20A | Not used (spare) |
| 5 | - | Not used |
| 6 | 10A | Power telescoping mirrors switch, Front power windows switch |
| 7 | 10A | Brake on-off switch |
| 8 | 5A | Embedded modem |
| 9 | 5A | Combined sensor module |
| 10 | - | Not used |
| 11 | - | Not used |
| 12 | 7.5A | On-board diagnostic module, Smart data link connector, Climate control module |
| 13 | 7.5A | Steering column control module, Instrument cluster |
| 14 | 15A | Not used |
| 15 | 15A | SYNC, Display |
| 16 | - | Not used |
| 17 | 7.5A | Active front steering module, Park aid module |
| 18 | 7.5A | Selectable drive modes switch, Select shift switch |
| 19 | 5A | Head up display |
| 20 | 5A | Ignition switch, Key inhibit solenoid |
| 21 | 5A | Head up display, In-vehicle temperature and humidity sensor |
| 22 | 5A | Upfitter switches |
| 23 | 30A | Driver front door module |
| 24 | 30A | Moonroof |
| 25 | 20A | Not used (spare) |
| 26 | 30A | Passenger front door module |
| 27 | 30A | Not used (spare) |
| 28 | 30A | Amplifier |
| 29 | 15A | Adjustable pedals switch |
| 30 | 5A | Brake on-off output to trailer brake controller and customer access circuits |
| 31 | 10A | Remote keyless entry |
| 32 | 20A | Radio |
| 33 | - | Not used |
| 34 | 30A | Run-start relay |
| 35 | 5A | Not used |
| 36 | 15A | Camera module, Lane keeping system, Auto-dimming interior mirror, Rear heated seats |
| 37 | 20A | Heated steering wheel |
| 38 | 30A | Power windows |
Engine compartment fuse box:
| Fuse/Relay N° | Rating | Functions |
| 1 | 20A | Power point 4 |
| 2 | 20A | Power point 3 |
| 3 | 10A | Spot light module |
| 4 | 10A | Four-wheel drive vacuum solenoid |
| 5 | 40A | Active front steering |
| 6 | 10A | Snow plow |
| 7 | 30A | Trailer tow battery charge |
| 8 | 10A | Anti-lock brake system module |
| 9 | 10A | Electronic power assisted steering module |
| 10 | 30A | Trailer tow park lamps |
| 11 | 20A | Horn |
| 12 | 30A | Torque overlay |
| 13 | 30A | Power sliding rear window |
| 14 | 40A | Body control module - battery power in feed 1 |
| 15 | 30A | Passenger seat power |
| 16 | 10A | Powertrain control module, Transmission control module |
| 17 | 10A | Blind spot information system |
| 18 | 10A | Four-wheel drive module |
| 19 | 5A | Adaptive cruise control |
| 20 | 15A | Heated mirrors |
| 21 | 40A | Heated rear window |
| 22 | 10A | On-board diagnostic module, Smart data link connector |
| 23 | 15A | Transmission control module |
| 24 | 30A | Driver power seat |
| 25 | 25A | Voltage quality module |
| 26 | 30A | Trailer tow battery charge |
| 27 | 20A | Rear heated seats |
| 28 |
25A - |
Glow plug (diesel) Not used (gas) |
| 29 | 40A | Electric power assisted steering motor |
| 30 | 10A | Not used (spare) |
| 31 | 20A | Power point 5 |
| 32 | 25A | Four-wheel drive module |
| 33 | 10A | Alternator sense line 2 |
| 34 | 50A | Electric cooling fan (gas), Supplemental air heater (diesel) |
| 35 | 20A | Power point 2 |
| 36 | 20A | Power point 1 |
| 37 | 60A | Anti-lock brake system pump |
| 38 | 60A | Inverter |
| 39 | 25A | Four-wheel drive module |
| 40 | 30A | Starter motor solenoid |
| 41 | 10A | Tailgate release solenoid |
| 42 | 40A | Blower motor |
| 43 | 10A | Trailer tow backup lamps |
| 44 | 40A | Trailer tow lighting module |
| 45 | 30A | Anti-lock brake system valve |
| 46 | 30A | Compressed natural gas module power |
| 47 |
50A - |
Supplemental air heater (diesel) Not used (gas) |
| 48 |
50A - |
Supplemental air heater (diesel) Not used (gas) |
| 49 | - | Not used |
| 50 | 30A | Heated and cooled seats |
| 51 | 20A | Powertrain control module |
| 52 | 15A | Compressed natural gas (gas), Fuel rail pressure relief control (diesel) |
| 53 | 20A | 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 | 20A | A/C clutch relay power, Fan clutch |
| 55 | 5A | Rain sensor |
| 56 | 30A | Windshield wipers |
| 57 | 10A | Upfitter interface module |
| 58 | 10A | Alternator sense line |
| 59 | 30A | Power running boards |
| 60 | 40A | Body control module - battery power in feed 2 |
| 61 | 10A | Telescopic mirror motors |
| 62 | 40A | Trailer brake control, Aftermarket e-brake access |
| 63 | 15A | Multi-contour seats |
| 64 | 20A | Ignition coil (gas), Glow plug module (diesel), Nitrogen oxide module (diesel), Urea level and quality sensor (diesel) |
| 65 | 30A | Fuel pump |
| 66 | 10A | A/C clutch solenoid |
| 67 | 40A | Auxiliary lighting module |
| 68 | 10A | Powertrain control module |
| 69 | 60A | Body control module power |
| 70 | 30A | Trailer tow stop and turn lamps |
