2021 International MV — Fuse Box Diagram & Amperage
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Quick Answer
The 2021 International MV typically features multiple fuse box locations to manage the complex electrical systems of a medium-duty commercial truck. You'll find fuse boxes located under the hood (engine compartment), inside the cabin (driver-side kick panel or dashboard area), and sometimes in the battery box or a dedicated compartment for accessory circuits, depending on the specific trim and upfit.
Under-Hood Fuse Box (Engine Compartment)
The under-hood fuse box houses fuses and relays for critical engine functions, lighting, and other high-current components. Always verify the exact layout with the diagram on your fuse box lid, as configurations can vary.
| Fuse # | Amperage | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 20A | Yellow | ECM (Engine Control Module) Power |
| F2 | 10A | Red | Ignition Switch |
| F3 | 15A | Blue | Fuel Pump Relay |
| F4 | 10A | Red | Starter Solenoid |
| F5 | 25A | Clear | Headlights - Low Beam (Left) |
| F6 | 25A | Clear | Headlights - Low Beam (Right) |
| F7 | 20A | Yellow | Headlights - High Beam (Left) |
| F8 | 20A | Yellow | Headlights - High Beam (Right) |
| F9 | 15A | Blue | ABS (Anti-lock Braking System) Pump Motor |
| F10 | 10A | Red | ABS (Anti-lock Braking System) Valve Solenoids |
| F11 | 30A | Green | Blower Motor High Speed |
| F12 | 15A | Blue | A/C Clutch Relay |
| F13 | 20A | Yellow | Trailer Brake Controller Power |
| F14 | 15A | Blue | Trailer Marker Lights |
| F15 | 10A | Red | Tail Lights / Parking Lights |
| R1 | Relay | Fuel Pump Relay | |
| R2 | Relay | Starter Relay | |
| R3 | Relay | Headlight Low Beam Relay | |
| R4 | Relay | Headlight High Beam Relay | |
| R5 | Relay | A/C Clutch Relay |
Cabin Fuse Box (Driver-Side Kick Panel/Dash)
Located inside the cab, often on the driver's side kick panel or behind a removable access panel on the dashboard, this fuse box handles interior electrical systems, accessories, and some control modules.
| Fuse # | Amperage | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10A | Red | Radio / Infotainment System |
| F2 | 15A | Blue | Cigar Lighter / 12V Power Outlet (Dash) |
| F3 | 10A | Red | Instrument Cluster |
| F4 | 5A | Tan | ECM/PCM Keep Alive Memory (KAM) |
| F5 | 10A | Red | ABS Module (Control Power) |
| F6 | 20A | Yellow | Blower Motor Low/Medium Speed |
| F7 | 10A | Red | Interior Cabin Lights |
| F8 | 15A | Blue | Power Windows |
| F9 | 10A | Red | Wipers |
| F10 | 15A | Blue | Auxiliary Power Outlet (Console) |
| F11 | 5A | Tan | Airbag Control Module |
| F12 | 20A | Yellow | Brake Lights |
| R1 | Relay | Accessory Delay Relay | |
| R2 | Relay | Blower Motor Relay |
How To Test a Fuse
Testing a fuse is a straightforward process that can help diagnose electrical issues. You will need a multimeter or a fuse tester.
- Locate the Fuse Box: Refer to your owner's manual or the quick answer above to find the correct fuse box.
- Identify the Suspect Fuse: Look at the fuse box diagram (usually on the inside of the lid) to find the fuse associated with the malfunctioning component.
- Visual Inspection: Many fuses have a clear plastic body. A quick visual check can often reveal a broken wire (filament) inside the fuse, indicating it's blown. For opaque fuses, you'll need a tester.
- Remove the Fuse: Use a fuse puller (often found in the fuse box lid or with the vehicle tools) or needle-nose pliers to carefully remove the suspect fuse.
- Test with a Multimeter:
- Set your multimeter to measure continuity (Ω or the continuity symbol, which usually beeps).
- Touch one probe of the multimeter to each metal terminal on the fuse.
- If the multimeter shows a reading (usually near 0 ohms) or beeps, the fuse is good. If it shows "OL" (open loop) or no reading/beep, the fuse is blown.
- Test with a Fuse Tester:
- A fuse tester typically has two prongs. Touch one prong to each metal terminal on the fuse.
- If the light on the tester illuminates, the fuse is good. If it doesn't light up, the fuse is blown.
- Replace if Blown: If the fuse is blown, replace it with a new fuse of the exact same amperage rating and type. Using a higher amperage fuse can cause serious damage to your vehicle's electrical system or even a fire.
Common Blown Fuses on This Vehicle
While any fuse can blow, some circuits are more prone to issues due to their constant use or exposure to variable loads. On a 2021 International MV, common culprits often include:
- Cigar Lighter / 12V Power Outlets (F2 in Cabin Fuse Box, 15A): These often blow due to short circuits from faulty chargers, overloaded accessories, or debris in the outlet. If your phone charger or other accessories aren't working, check this first.
- Trailer Brake Controller Power (F13 in Under-Hood Fuse Box, 20A): Issues with trailer wiring, a short in the trailer brake system, or an overloaded trailer can cause this fuse to blow. If your trailer brakes aren't functioning, inspect this fuse and your trailer
Before you pull a fuse on the 2021 International MV
- Use the label printed on the panel cover or the owner's manual for your exact build. Layouts change with options, model year and build date, so a chart for another truck can be wrong.
- Replace a blown fuse only with the same amp rating. A larger fuse can let wiring overheat.
- A fuse that blows again right away means a short or failing component downstream. Find the cause before replacing it again.
- A good fuse doesn't prove the circuit works — relays, grounds and connectors fail too.
- Many heavy trucks have more than one power distribution point (cab, under-hood or near the batteries), and some circuits use circuit breakers instead of fuses. Some systems have 24-volt starting circuits; confirm the voltage before testing.
- Disconnect the battery before working near high-current fuses or cables.
Learn more: How fuses, relays and truck electrical systems work · Find mobile truck repair
More specs for the 2021 International MV
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2021 International MV Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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