2025 International LT Fuse Box Diagram & Amperage

Quick Answer

The 2025 International LT typically features three main fuse box locations:

• Under-hood Fuse Box: Located in the engine compartment, usually on the driver's side.
• Cab Fuse Box (Driver's Side Kick Panel): Situated inside the cabin, accessible by removing the cover on the driver's side kick panel.
• Frame Rail Fuse Box (Mid-Chassis): Often found along the frame rail, usually on the driver's side, mid-chassis.

Under-hood Fuse Box

The under-hood fuse box primarily houses fuses and relays for high-current circuits and critical engine functions. This box often contains fuses for the ECM/PCM, fuel pump, ignition, starter relay, and major lighting components.

Note: Fuse configurations can vary slightly due to different trim levels and optional equipment. Always consult the fuse diagram printed on the inside of the fuse box cover for the most accurate information for your specific vehicle.

Cab Fuse Box (Driver's Side Kick Panel)

This fuse box manages electrical components within the cabin, including the radio, infotainment system, blower motor, wipers, power windows, and various accessory outlets.

Note: Refer to the fuse legend on the cover for precise details regarding fuse assignments for your specific vehicle.

Frame Rail Fuse Box (Mid-Chassis)

This fuse box often handles high-current accessories and systems located further from the cab and engine, such as trailer brakes, auxiliary lighting, and certain vehicle body functions. This is particularly relevant for commercial trucks like the International LT.

Note: Given the customizable nature of commercial vehicles, verify the exact layout and fuse functions with your truck's specific documentation or the fuse box lid.

How to Test a Fuse

Testing a fuse is a straightforward process and requires a fuse puller (often located in one of the fuse boxes) and a multimeter or a fuse tester. Always ensure the ignition is off before testing fuses.

1. Locate the fuse: Identify the suspected fuse using the fuse diagram on the fuse box cover.
2. Remove the fuse: Carefully pull the fuse straight out using the fuse puller.
3. Inspect visually: Look at the fuse element (the small wire connecting the two prongs). If it's broken or melted, the fuse is blown and needs replacement.
4. Test with a multimeter (for less obvious breaks): Set your multimeter to the continuity setting (often indicated by a speaker icon). Touch each probe of the multimeter to the metal prongs of the fuse. If the multimeter beeps or shows a reading close to zero ohms, the fuse is good. If there's no beep or an "OL" (open loop) reading, the fuse is blown.
5. Replace with the correct fuse: Always replace a blown fuse with a new one of the exact same amperage (A) rating and type. Using a fuse with a higher amperage rating can lead to serious electrical damage or fire.

Common Blown Fuses on This Vehicle

While fuses can blow for various reasons, some are more common than others due to the nature of the circuits they protect or the components they power. If you experience an electrical issue, start by checking these frequently problematic fuses:

• Cigar Lighter / 12V Outlets: These fuses often blow due to overloads from charging multiple devices or using high-power accessories. If your phone charger or accessory isn't working, check the corresponding fuse in the cab fuse box.
• Headlights / Tail Lights: While less common in newer vehicles, a short in a bulb or wiring can still cause these fuses to blow, leading to partial or complete loss of lighting. Always check the bulbs first if a lighting circuit fuse blows.
• Blower Motor: If your heating or AC fan stops working, the blower motor fuse in the cab fuse box is a prime suspect. A failing blower motor or an obstruction can draw excessive current, blowing the fuse.
• Trailer Brake Controller: Given the heavy-duty nature of the International LT, the trailer brake controller fuse can blow if there's a short in the trailer's wiring or an issue with the brake controller itself. If your trailer brakes aren't functioning, this is a good place to start in the frame rail fuse box.
• Radio / Infotainment: Modern infotainment systems are complex, and sometimes a glitch or an added accessory can cause its fuse to blow. If your radio is dead, check its fuse in the cab.

Always remember to check the component itself and its associated wiring for any obvious damage or shorts if a fuse repeatedly blows.

Find a trusted shop on Repairius.