2023 International MV Fuse Box Diagram & Amperage

Quick Answer

The 2023 International MV Series medium-duty truck typically has one primary fuse and relay center, located in the cab. Unlike passenger cars, it does not have under-hood or trunk-mounted fuse boxes.

• In-Cab Fuse Box: Located on the passenger side of the cab, behind a kick-panel or access door at the bottom of the dashboard.

In-Cab Fuse & Relay Center

This is the main fuse and relay panel for the entire truck. The layout can vary slightly based on the truck's specific configuration (e.g., optional equipment, body builder modifications). Always confirm the fuse locations and ratings by checking the diagram printed on the inside of the fuse box cover.

Relay Locations (In-Cab Panel)

The same panel also houses critical relays. Their positions are generally marked on the panel cover's diagram.

• Starter Relay: Controls the signal to the starter motor solenoid.
• Ignition Relay: Powers up main vehicle systems when the key is turned on.
• Headlight Relay (Low/High): Manages power to the headlight circuits.
• Blower Motor Relay: Handles the high-current load for the HVAC fan.
• Fuel Pump Relay: Controls power to the fuel pump.
• A/C Clutch Relay: Engages the air conditioning compressor.
• Park Lamp Relay: Controls the parking and marker lights.
• ABS Relay: Provides power to the Anti-lock Braking System.

How to Test a Fuse

Testing a fuse is a simple diagnostic step to determine if it's the cause of an electrical problem. You'll need a fuse puller (often included in the fuse box lid) or a pair of needle-nose pliers, and a multimeter or a 12V test light.

1. Safety First: Turn the vehicle's ignition completely off.
2. Locate and Remove: Open the fuse panel and identify the suspect fuse using the diagram. Gently remove it using a fuse puller or pliers.
3. Visual Inspection: Hold the fuse up to the light. Inside the plastic body, you'll see a small metal strip. If this strip is broken or looks burnt, the fuse is blown.
4. Multimeter Test (Recommended): For a more definitive test, set your multimeter to the continuity setting (it often looks like a sound wave symbol). Touch one probe to each metal blade on the top of the fuse. If the multimeter beeps or shows a reading of near-zero ohms, the fuse is good. If it remains silent or reads "OL" (Open Loop), the fuse is blown and needs to be replaced.
5. Replacement: Always replace a blown fuse with a new one of the exact same amperage rating. Using a higher-amperage fuse can cause a fire hazard by allowing too much current through the circuit, potentially melting wires.

Common Blown Fuses on the 2023 International MV

While this is a new model, certain circuits on commercial trucks consistently see more issues due to high use and exposure to the elements.

• Cigar Lighter / 12V Power Port Fuses (Fuses 4, 16): These are the most common fuses to blow. The cause is almost always a faulty or high-draw device plugged into the outlet (e.g., a phone charger with an internal short, a power inverter that pulls too much current). What to check first: Unplug all devices from the power ports. Replace the fuse. If it blows again immediately, the outlet itself may be shorted. If it only blows when you plug a specific device in, that device is the problem.
• Trailer Light Fuses (Fuses 1, 2): Issues with trailer wiring are extremely common. A short in the trailer's wiring harness, a corroded connector, or a faulty bulb on the trailer can cause these fuses to blow. What to check first: Disconnect the trailer. Replace the fuse in the truck. If the fuse does not blow, the problem is with the trailer's wiring, not the truck. Inspect the trailer's pigtail connector and wiring for any damage.
• Blower Motor Fuse (Fuse 27): If your HVAC fan stops working on all speeds, this fuse is a likely culprit. This can be caused by an aging blower motor that is drawing too much current before it fails completely. What to check first: If replacing the fuse restores fan operation temporarily, but it blows again after a short time, the blower motor itself is likely failing and needs replacement.

Note on Trim and Body Variations: International trucks are often customized by body builders for specific applications (e.g., box truck, flatbed, utility body). This can sometimes lead to additional, supplementary fuse panels being installed to control body-specific equipment like liftgates or auxiliary lighting. If you cannot find a fuse for a particular component in the main cab panel, look for a secondary fuse block installed by the body manufacturer.

Find a trusted shop on Repairius.