2018 International MV Fuse Box Diagram & Amperage
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Quick answer
The 2018 International MV typically features fuse boxes in three primary locations: under the hood (engine compartment), inside the cabin (driver's side dash kick panel), and in the battery/chassis area, often near the transmission or frame rail, or occasionally in the sleeper compartment for certain configurations.
Under-hood Fuse Box
The under-hood fuse box, often located on the driver's side near the firewall, houses critical fuses and relays for major powertrain, charging, and under-hood accessories. Always consult the printed diagram on the fuse box lid for exact locations as these can vary by specific MV chassis and upfits.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 15A | Blue | ECM / PCM Power |
| F2 | 10A | Red | Ignition Switch Input |
| F3 | 20A | Yellow | Fuel Pump Relay / Circuit |
| F4 | 25A | Clear | Starter Relay Control |
| F5 | 20A | Yellow | Headlight Low Beam (Left) |
| F6 | 20A | Yellow | Headlight Low Beam (Right) |
| F7 | 15A | Blue | Headlight High Beam (Left) |
| F8 | 15A | Blue | Headlight High Beam (Right) |
| F9 | 10A | Red | Parking / Tail Lights (Left) |
| F10 | 10A | Red | Parking / Tail Lights (Right) |
| F11 | 20A | Yellow | ABS System (ECU Power) |
| F12 | 30A | Green | Trailer Brake Controller Power (Main) |
| F13 | 10A | Red | Washer Pump |
| F14 | 20A | Yellow | Horn |
| F15 | 15A | Blue | HVAC Blower Motor Relay Control |
| F16 | 10A | Red | A/C Clutch Relay Control |
| R1 | ECM / PCM Main Relay | ||
| R2 | Fuel Pump Relay | ||
| R3 | Starter Relay | ||
| R4 | Headlight Low Beam Relay | ||
| R5 | Headlight High Beam Relay | ||
| R6 | ABS System Relay |
Cabin Fuse Box (Dash Kick Panel)
The cabin fuse box is typically located on the driver's side, often behind a kick panel or access door near the steering column. This box manages fuses for interior accessories, lighting, and convenience features.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10A | Red | Radio / Infotainment System |
| F2 | 15A | Blue | 12V Accessory Outlet / Cigarette Lighter |
| F3 | 25A | Clear | HVAC Blower Motor Main Power |
| F4 | 10A | Red | Interior Dome Lights |
| F5 | 10A | Red | Instrument Cluster / Gauges |
| F6 | 10A | Red | ABS Warning Lights |
| F7 | 20A | Yellow | Wiper Motor |
| F8 | 15A | Blue | Power Windows (If equipped) |
| F9 | 15A | Blue | Cruise Control Module |
| F10 | 10A | Red | Airbag / SRS Module |
| F11 | 10A | Red | Brake Lights |
| F12 | 10A | Red | Auxiliary Power Outlet (Cabin) |
| R1 | Blower Motor Relay | ||
| R2 | Accessory Delay Relay |
Chassis Fuse Box (Battery Box / Frame Rail / Sleeper)
For heavy-duty vehicles like the International MV, an additional fuse box is often present near the battery box, along the frame rail, or occasionally within a sleeper compartment for models so equipped. This box typically handles high-amperage circuits for chassis-mounted equipment, body builder connections, and heavy-duty accessories.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 40A | Green | Main Power Distribution (Body Builder) |
| F2 | 30A | Green | ABS Module (Primary Power) |
| F3 | 20A | Yellow | Trailer ABS Power |
| F4 | 20A | Yellow | Liftgate Power (If equipped) |
| F5 | 15A | Blue | Auxiliary Battery Charging |
| F6 | 25A | Clear | Power Take-Off (PTO) System (If equipped) |
| F7 | 30A | Green | Engine ECM (Main Power) |
| F8 | 20A | Yellow | Transmission Control Module (TCM) |
| R1 | Main Chassis Power Relay | ||
| R2 | PTO System Relay |
How to test a fuse
Testing a fuse is a straightforward process and a crucial first step in diagnosing electrical issues. Here's how to do it:
- Safety First: Always turn off the ignition and remove the key before working with fuses. If testing an under-hood fuse box, disconnect the battery's negative terminal for extra safety.
- Locate the Fuse: Refer to the fuse box diagram (usually under the lid) to identify the suspect fuse.
- Visual Inspection: Most modern fuses have a small window through which you can see the metal filament inside. If the filament is broken or a dark, burnt mark is visible, the fuse is blown. However, not all blown fuses have obvious visual cues.
- Use a Fuse Tester or Multimeter:
- Fuse Tester: Insert the tester's probes into the small test points on the top of the fuse (without removing it). If the tester lights up, the fuse is good. If it doesn't, the fuse is blown.
- Multimeter: Set your multimeter to measure continuity (often indicated by a speaker symbol or an ohm symbol). Remove the fuse from its slot. Touch one probe to each metal blade of the fuse. If the multimeter beeps or shows a reading close to zero ohms, the fuse is good. If it shows
Before you pull a fuse on the 2018 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 2018 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
2018 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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