Ford Mustang 2020 Fuse Replacement
Having an electrical issue? It could be a blown fuse — an easy fix you can do yourself.
Follow the steps below to find and replace the fuse:
Step 1: Find the Fuse Box
In your Ford Mustang 2020, the interior fuse box is typically located under the dashboard on the driver's side. Some vehicles also have an additional fuse box in the engine compartment. Check your owner's manual or the fuse box cover for the exact location.
Step 2: Identify the Corresponding Fuse
Below is the complete fuse list for your vehicle. Find the circuit that isn't working and note the fuse number and amperage.
Passenger compartment Fuse Box
| Fuse # | Function | Amperage |
|---|---|---|
| 1 | Not used. | |
| 2 | Power windows. Electrochromic mirror. Power door locks. | 10 |
| 3 | Power mirrors (base). Memory seats (base). Not used (GT350, GT500). | 7.5 |
| 4 | Not used (spare). | 20 |
| 5 | Not used. | |
| 6 | Not used (spare). | 10 |
| 7 | Not used (spare). | 10 |
| 8 | Telematic control unit - modem. | 5 |
| 9 | Not used. | 5 |
| 10 | Not used. | |
| 11 | Not used. | |
| 12 | Electronic control panel. Gateway module. Gear shift module (GT500). | 7.5 |
| 13 | Steering column control module. Instrument cluster. | 7.5 |
| 14 | Not used. | 15 |
| 15 | SYNC. Gauges. | 15 |
| 16 | Not used. | |
| 17 | Headlamp leveling switch (base). Not used (GT350, GT500). | 7.5 |
| 18 | Not used. | 7.5 |
| 19 | Not used. | 5 |
| 20 | intrusion sensor module. | 5 |
| 21 | In-vehicle temperature and humidity sensor. | 5 |
| 22 | Auxiliary body module. | 5 |
| 23 | Amplifier. | 30 |
| 24 | Vehicle dynamics module. | 30 |
| 25 | Ambient lighting module (base). Auxiliary body module. | 20 |
| 26 | Right-hand front-window motor (power distribution module). Passenger door control unit. | 30 |
| 27 | Left-hand rear-window power (base). Not used (GT350, GT500). | 30 |
| 28 | Right-hand rear-window power (base). Not used (GT350, GT500). | 30 |
| 29 | Gateway module (base). Not used (spare) (GT350, GT500). | 15 |
| 30 | Not used (spare) | 5 |
| 31 | Remote keyless entry. | 10 |
| 32 | Audio unit. | 20 |
| 33 | Not used. | |
| 34 | Run/start bus. | 30 |
| 35 | Power distribution box run/start relay (base). Not used (GT350, GT500). | 5 |
| 36 | Front camera (base). Not used (GT350, GT500). | 15 |
| 37 | Heated steering wheel module (base). Run/start powertrain control module (GT350). Not used (GT500). | 20 |
Power distribution box Fuse Box
| Fuse # | Function | Amperage |
|---|---|---|
| 1 | Electronic fan 1 (GT500). Not used (base, GT350). | 60 |
| 2 | Not used. | |
| 3 | Electronic fan 1 (base). Not used (GT350, GT500). | 30 |
| 4 | Electronic fan 3 (base). Not used (GT350, GT500). | 40 |
| 5 | Automatic brake system pump. | 50 |
| 6 | Body control module. | 50 |
| 7 | Body control module. | 60 |
| 8 | Body control module. | 50 |
| 9 | Rear window defroster. | 40 |
| 10 | Blower motor. | 40 |
| 11 | Left-hand front window. | 30 |
| 12 | Driver seat. | 30 |
| 13 | Passenger seat. | 30 |
| 14 | Climate-controlled seat module. | 30 |
| 15 | Convertible top slave motor (base). Not used (GT350, GT500). | 20 |
| 16 | Charge air cooler pump (GT500). Not used (base, GT350). | 15 |
| 17 | Convertible top master motor (base). Not used (GT350, GT500). | 20 |
| 18 | Not used. | |
| 19 | Steering column lock relay (base, GT350) (20A). Transmission control unit (GT500) (10A). | 20 |
| 20 | Brake on-off switch. | 10 |
| 21 | Horn. | 20 |
| 22 | Powertrain control module relay. | 10 |
| 23 | Air conditioning clutch. | 10 |
| 24 | Voltage quality module. | 30 |
| 25 | Steering column lock relay (GT500). Not used (base, GT350). | 20 |
| 26 | Windshield wiper motor. | 25 |
| 27 | Not used. | |
| 28 | Automatic brake system valve. | 30 |
| 29 | Electronic fan 1 (GT350). Not used (base, GT500). | 30 |
| 30 | Starter motor solenoid. | 30 |
| 31 | Electronic fan 3 (GT350). Not used (base, GT500). | 40 |
| 32 | Latch relay coil. | 10 |
| 33 | Run/start (base). | 15 |
| 34 | Exhaust valves. | 15 |
| 35 | Right-hand high-intensity discharge headlamps (GT350, GT500). Not used (base). | 20 |
| 36 | Alternator sense. | 10 |
| 37 | Not used. | |
| 38 | Vehicle power 1. | 20 |
| 39 | Not used. | |
| 40 | Vehicle power 2. | 20 |
| 41 | Fuel injectors. | 15 |
| 42 | Vehicle power 3. | 15 |
| 43 | Not used. | |
| 44 | Vehicle power 4 (base) (15A). Vehicle power 4 (GT350, GT500) (30A). | 15 |
| 45 | Not used. | |
| 46 | Differential pump (GT350. GT500). Not used (base). | 20 |
| 47 | Not used. | |
| 48 | Fuel pump #2 (GT350, GT500). Not used (base). | 30 |
| 49 | Fuel pump. | 30 |
| 50 | Steering column lock relay (base, GT500). Not used (GT350). | |
| 51 | Not used. | |
| 52 | Horn relay. | |
| 53 | Cigar lighter. | 20 |
| 54 | Auxiliary power point. | 20 |
| 55 | Electronic fan 2 (base, GT350). Not used (GT500). | 25 |
| 56 | Not used. | |
| 57 | Air conditioning clutch relay. | |
| 58 | Not used. | |
| 59 | Exhaust valves relay. | |
| 60 | Powertrain control module. | 5 |
| 61 | Not used. | |
| 62 | Anti-lock brakes run/start switch. | 5 |
| 63 | Not used. | |
| 64 | Electronic power assist steering. | 5 |
| 65 | Not used. | |
| 66 | Blind spot information system. Rear view camera. Rear window defroster relay coils. Vehicle dynamics module. | 5 |
| 67 | Not used. | |
| 68 | Headlamp leveling switch (base). Signature lighting (GT350, GT500). | 10 |
| 69 | Cigar lighter relay. Auxiliary power point relay. | |
| 74 | Mass air flow sensor (base, GT350). Not used (GT500). | 5 |
| 75 | Rain sensor module (base). Not used (GT350, GT500). | 5 |
| 76 | Rear window defroster relay. | |
| 77 | Electronic cooling fan 2 relay (base, GT350). Not used (GT500). | |
| 78 | Run/start relay (base). Not used (GT350, GT500). | |
| 79 | Charge air cooler pump relay (GT500). Not used (base, GT350). | |
| 80 | Windshield wiper relay. | |
| 81 | Starter motor solenoid relay. | |
| 82 | Powertrain control module relay. | |
| 83 | Cooling fan relay (GT500). Not used (base, GT350). | |
| 87 | Heated exterior mirrors. | 10 |
| 88 | Not used. | |
| 89 | Electronic fan 1 relay (base, GT350). Not used (GT500). | |
| 90 | Differential pump relay (GT350, GT500). Not used (base). | |
| 91 | Electronic fan 3 relay (base, GT350). Not used (GT500). | |
| 92 | Blower motor relay. | |
| 93 | Fuel pump #2 relay (GT350, GT500). Not used (base). | |
| 94 | Fuel pump relay. |
Step 3: Check the Fuse
Use the plastic fuse puller, typically found in the fuse box, to remove the fuse. Hold it up to a light source. If the metal filament inside is broken or charred, the fuse is bad and needs to be replaced.
Step 4: How to Get a Replacement
You can buy a replacement fuse at any auto parts store. Make sure you match the **amperage (A)** and **physical size** of the fuse exactly. For example, if you need a 20A fuse, get a 20A fuse.
Step 5: Replace the Fuse
Gently press the new fuse into the empty slot. You should feel a slight click when it's securely in place. Test the affected circuit to confirm it's working again.
What Now?
Fuse Was Blown — What to Buy
Ask at any auto parts store (AutoZone, O'Reilly, Advance Auto) for a blade fuse with the same amperage printed on the old one (e.g., 10A, 15A, 20A). Also match the physical size — mini (most modern cars), standard, or maxi. Replacement fuses cost under $5 and most stores sell assorted packs.
Fuse Looks Fine — Other Causes
If the fuse is intact, the problem isn't a blown fuse. Common alternatives include a bad relay (a click-sized electrical switch), a faulty wiring connection, or a failed component (motor, switch, module). At this point, a mechanic's diagnostic is the most reliable next step.
Frequently Asked Questions
What happens if I put in the wrong amperage fuse?
Higher amperage fuses won't protect the circuit and can cause wiring damage or fire. Lower amperage fuses will blow again immediately. Always match the exact amperage.
Why does my fuse keep blowing?
A repeatedly blown fuse indicates an underlying short circuit or overload. Replacing it again won't fix the root cause — consult a mechanic.
Do I need any tools?
Most cars come with a plastic fuse puller in the fuse box lid. If not, fine-tip needle-nose pliers work. A small flashlight helps.
How do I know what size fuse to buy?
Match the amperage printed on the old fuse (e.g., 10A, 15A, 20A) and the physical blade size (mini, standard, maxi). Auto parts stores carry assorted packs.