2021 Ford Ranger Fuse Box: What Each Fuse Does
From the 2021 Ford Ranger owner's manual. 4 fuse boxes listed.
Power Distribution Box
| Fuse | Amps | Circuit |
|---|---|---|
| 1 | 15 A | Not used (spare). |
| 2 | Relay | Starter motor solenoid relay. |
| 3 | 5 A | Rain sensor. |
| 4 | Relay | Blower motor relay. |
| 5 | 20 A | Auxiliary power point 3 - console rear. |
| 6 | Relay | Trailer park lamp relay. |
| 7 | 20 A | Powertrain control module. |
| 9 | Relay | Powertrain control module relay. |
| 10 | 20 A | Auxiliary power point 1 - instrument panel. |
| 11 | 15 A | Ignition coils. |
| 12 | 15 A | A/C control drive. |
| 13 | 15 A | Transaxle warmer. Auxiliary water pump. Aspirator valve control. Fan clutch. Oil pump. Turbo bypass. |
| 14 | 15 A | Not used (spare). |
| 15 | Relay | Run/start relay. |
| 16 | 20 A | Auxiliary power point 2 - instrument panel. |
| 17 | 20 A | Auxiliary power point - rear cargo area. |
| 18 | 10 A | Not used (spare). |
| 19 | 10 A | Electric power assist steering. |
| 20 | 10 A | Lighting control switch. |
| 21 | 5 A | Transmission Run/Start relay. |
| 22 | 10 A | Air conditioning compressor. |
| 23 | 7.5 A | Voltage quality module. |
| 24 | 10 A | Not used (spare). |
| 25 | 10 A | Anti-lock brake system. |
| 26 | 10 A | Not used (spare). |
| 27 | – | Not used. |
| 28 | 10 A | Powertrain control module. |
| 29 | 7.5 A | USB charge port. |
| 30 | – | Not used. |
| 31 | – | Not used. |
| 32 | Relay | Fuel pump relay. |
| 33 | Relay | A/C clutch relay. |
| 34 | 10 A | Trailer reverse lamp. |
| 35 | 15 A | Not used (spare). |
| 36 | – | Not used. |
| 37 | 10 A | Heated exterior mirror. |
| 38 | Relay | Trailer right-hand turn and stop lamp relay. |
| 39 | Relay | Trailer left-hand turn and stop lamp relay. |
| 40 | Relay | Trailer reverse lamp relay. |
| 41 | Relay | Horn relay. |
| 42 | Relay | 4WD (four-wheel drive) motor no. 2 relay. |
| 43 | – | Not used. |
| 44 | – | Not used. |
| 45 | 5 A | Not used (spare). |
| 46 | 10 A | Not used (spare). |
| 47 | 10 A | Brake pedal switch. |
| 48 | 20 A | Horn. |
| 56 | 15 A | Trailer left-hand turn and stop. |
| 57 | – | Not used. |
| 58 | – | Not used. |
| 59 | – | Not used. |
| 60 | 30 A | Fuel pump control module. |
| 61 | – | Not used. |
| 62 | 50 A | Body control module 1 - lighting. |
| 63 | 15 A | Trailer right-hand turn and stop. |
| 64 | 30 A | Trailer brakes. |
| 65 | 20 A | Heated driver seat. |
| 66 | 25 A | Four-wheel drive. |
| 67 | 50 A | Body control module 2 - lighting. |
| 68 | 30 A | Rear window defroster. |
| 69 | 30 A | Anti-lock brake system valves. |
| 70 | 30 A | Passenger power seat. |
| 71 | 25 A | Trailer park lamps. |
| 72 | – | Not used. |
| 73 | 30 A | Trailer module. |
| 74 | 30 A | Driver power seat. |
| 75 | – | Not used. |
| 76 | – | Not used. |
| 77 | – | Not used. |
| 78 | – | Not used. |
| 79 | 40 A | Blower motor. |
| 80 | 20 A | Heated passenger seat. |
| 81 | 40 A | Inverter. |
| 82 | 60 A | Anti-lock brake system pump. |
| 83 | 30 A | Windshield wiper motor. |
| 84 | 30 A | Starter motor solenoid. |
| 85 | – | Not used. |
| 87 | 40 A | Trailer module. |
Source: owner's manual, PDF pages 252, 253, 254, 257, 258, 259.
High Current Fuse Box
| Fuse | Amps | Circuit |
|---|---|---|
| 1 | – | Not used. |
| 2 | 125 A | Body control module. |
| 3 | 50 A | Voltage quality module (supplies rear lamp blind spot, rear view camera, head up display, 4x4 switch, image processing module and adaptive cruise control radar). |
| 4 | – | Busbar through to power distribution box. |
| 5 | 100 A | Auxiliary fuse and relay box. |
Source: owner's manual, PDF page 260.
Passenger Compartment Fuse Box
Location: Below and outboard of the steering column behind the access cover.
| Fuse | Amps | Circuit |
|---|---|---|
| 1 | – | Not used. |
| 2 | 7.5 A | Not used (spare). |
| 3 | 20 A | Driver door lock. |
| 4 | 5 A | Not used (spare). |
| 5 | 20 A | Branded audio amplifier. |
| 6 | 10 A | Not used (spare). |
| 7 | 10 A | Not used (spare). |
| 8 | 10 A | Anti-theft alarm horn. |
| 9 | 10 A | Telematics. |
| 10 | 5 A | Not used (spare). |
| 11 | 5 A | Not used (spare). |
| 14 | 10 A | Extended power module (for restraints module and occupant module). |
| 16 | 15 A | Not used (spare). |
| 17 | 5 A | Not used (spare). |
| 19 | 7.5 A | Extended power module (for restraints module and occupant module). |
| 20 | 7.5 A | Auxiliary switches. |
| 21 | 5 A | Humidity and in-car temperature sensor. |
| 22 | 5 A | Not used (spare). |
| 23 | 10 A | Inverter. |
| 24 | 20 A | Door lock switch. Central locking system. |
| 25 | 30 A | Driver door power window. |
| 26 | 30 A | Not used (spare). |
| 27 | 30 A | Not used (spare). |
| 28 | 20 A | Branded audio amplifier. |
| 29 | 30 A | Not used (spare). |
| 30 | 30 A | Not used (spare). |
| 31 | 15 A | SYNC. |
| 33 | 20 A | Audio unit. |
| 34 | 30 A | Run/start relay. |
| 35 | 5 A | Not used (spare). |
| 37 | 20 A | Not used (spare). |
| 38 | 30 A | Power windows. |
Auxiliary Fuse and Relay Box
Location: Left front of the engine compartment
| Fuse | Amps | Circuit |
|---|---|---|
| 1 | 25 A | Fuse 11A and 11B. |
| 2 | 20 A | Fuse 12A and 12B. |
| 3 | 25 A | Relay AUX1. |
| 4A | – | Not used. |
| 4B | – | Not used. |
| 5 | 15 A | Relay AUX2. |
| 6 | – | Not used. |
| 7 | – | Not used. |
| 8 | – | Not used. |
| 9 | – | Not used. |
| 10 | – | Not used. |
| 11A | 10 A | Relay AUX3. |
Source: owner's manual, PDF page 413.
Listings are copied as text from the manual's fuse tables (AI-assisted; every circuit name was matched against the cited pages 2026-10-20). A dash in the amps column means the manual prints no rating for that position. 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.
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