Ford Super Duty Fuse Box: What Each Fuse Does
From the 2026 Ford Super Duty owner's manual. 2 fuse boxes listed.
Fuses
| Fuse | Amps | Circuit |
|---|---|---|
| 15 | 30 A | Body control module power bus. |
| 21 | 10 A | Trailer tow backup lamps. |
| 22 | 10 A | Four-wheel drive system. |
| 23 | 20 A | Vehicle power 1. |
| 24 | 20 A | Vehicle power 2 (gas). |
| 24 | 10 A | Vehicle power 2 (diesel). |
| 25 | 15 A | Vehicle power 3 (gas). |
| 25 | 10 A | Vehicle power 3 (diesel). |
| 26 | 20 A | Vehicle power 4. |
| 27 | 10 A | Vehicle power 5 (gas). |
| 27 | 20 A | Vehicle power 5 (diesel). |
| 29 | 15 A | Diesel exhaust fluid tank heater. |
| 30 | 15 A | Diesel exhaust fluid line heater. |
| 31 | 15 A | Glow plug and dosing module. |
| 34 | 20 A | Rear heated seats. |
| 36 | 30 A | Climate controlled seat module. |
| 37 | 5 A | 24 V alternator. |
| 38 | 10 A | Powertrain control module. |
| 39 | 10 A | Transmission control module. Anti-lock brake system. |
| 40 | 10 A | Electronic power assist steering. |
| 41 | 10 A | Blind spot information system. |
| 42 | 10 A | Trailer tow tire pressure monitoring system. Rear electronic module controller area network. Snowplow. |
| 43 | 15 A | Interior power distribution box run/start. |
| 45 | 15 A | Heated steering wheel. |
| 46 | 20 A | Not used (spare). |
| 47 | 5 A | Not used (spare). |
| 48 | 30 A | Amplifier. |
| 49 | 25 A | Not used (spare). |
| 51 | 40 A | Blower motor. |
| 52 | – | Not used. |
| 53 | 10 A | Four-wheel drive - transfer case control module. |
| 54 | 10 A | Not used (spare). |
| 55 | 10 A | Not used (spare). |
| 56 | 40 A | Electronic power assist steering. |
| 57 | 25 A | Trailer tow lighting module. |
| 58 | 50 A | Customer interface module. |
| 59 | 60 A | Inverter. |
| 60 | 60 A | Interior power distribution box B+. |
| 61 | 30 A | Vehicle battery 2. |
| 62 | 5 A | Smart trailer hitch. |
| 63 | 10 A | Smart data link connector. |
| 64 | 5 A | Enhanced central gateway. Glow plug relay coil (diesel). |
| 65 | 10 A | Compressed natural gas module power. |
| 74 | 30 A | Trailer brake control. |
| 75 | 30 A | Aftermarket e-brake access. Compressed natural gas powered at all times. |
| 76 | 25 A | Trailer tow lighting module battery charge. |
| 77 | 30 A | Vehicle battery 1. |
| 78 | 20 A | Power point 2. |
| 79 | 20 A | Power point 1. |
| 84 | 20 A | Horn. |
| 85 | 40 A | Heated rear windshield. |
| 91 | 5 A | Headlamp control module. |
| 92 | 15 A | Left-hand headlamp. |
| 93 | 15 A | Right-hand headlamp. |
| 94 | 20 A | Power point 3. |
| 95 | 20 A | Power point 4. |
| 98 | 10 A | Smart charge module. Tailgate release. |
| 101 | 50 A | Customer interface module. |
| 102 | 5 A | Rain sensor. |
| 103 | 30 A | Front wiper motor. |
| 105 | 30 A | Fuel pump. |
| 106 | 30 A | Body control module power bus. |
| 107 | 30 A | Trailer tow park lamps. |
Fuses
| Fuse | Amps | Circuit |
|---|---|---|
| 14 | 15 A | SYNC. |
| 15 | 5 A | Center high-mounted stop lamp camera. |
| 16 | – | Not used. |
| 17 | – | Not used. |
| 19 | – | Not used. |
| 20 | 5 A | Inverter. |
| 21 | 5 A | Upfitter switch. |
| 22 | 10 A | Auxiliary camera. |
| 23 | – | Not used. |
| 24 | 30 A | Moonroof. |
| 25 | 5 A | Not used (spare). |
| 26 | 5 A | Not used (spare). |
| 27 | 5 A | Trailer brake control switch. |
| 28 | 5 A | Electrochromatic mirror. |
| 29 | 5 A | Heating, ventilation and air conditioning. |
| 30 | – | Not used. |
| 31 | – | Not used. |
| 32 | – | Not used. |
| 33 | 10 A | Brake on-off switch. |
| 34 | 7.5 A | Steering column control module. |
| 35 | 5 A | Instrument cluster. Rear heated seats. |
| 37 | 5 A | Head up display. |
| 38 | 7.5 A | Telematics control unit. |
| 39 | – | Not used. |
| 41 | 10 A | Adjustable pedals. |
| 42 | 5 A | Central security module. |
| 44 | 30 A | Driver door module. |
| 46 | 20 A | Radio. |
| 47 | – | Not used. |
| 48 | – | Not used. |
| 49 | 7.5 A | SYNC display screen. |
| 50 | 5 A | Auxiliary smart data link connector. |
| 51 | – | Not used. |
Listings are copied as text from the manual's fuse tables (AI-assisted; every circuit name was matched against the cited pages 2026-10-18). Fuse layouts can differ by trim and year; check the label on the fuse box cover before replacing a fuse, and always use the same amp rating.
Confirm with your own manual, dipstick or door-jamb label.
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