2024 International LT — Fuse Box Diagram & Amperage

Quick Answer

The 2024 International LT typically features its primary fuse boxes in three main locations: under the hood (Engine Compartment Fuse Box), inside the cabin (Dash Fuse Box, often behind a kick panel), and sometimes a supplemental fuse box in the sleeper or rear cabin area (Sleeper/Cabin Fuse Box), depending on the specific trim and options.

Your 2024 International LT is a robust heavy-duty truck, and understanding its electrical system, particularly the fuse boxes, is crucial for both routine maintenance and troubleshooting. This guide will help you locate and identify the functions of various fuses and relays in your truck. Always refer to your vehicle's owner's manual and the fuse box lid diagrams for the most accurate and up-to-date information, as configurations can vary slightly due to trim levels and optional equipment.

Under-Hood Fuse Box (Engine Compartment Fuse Box)

This fuse box is usually located on the driver's side of the engine compartment, near the firewall. It houses fuses and relays for critical engine functions, lighting, and other high-current components.

Relay Locations (Under-Hood):

• R1: Starter Relay
• R2: Fuel Pump Relay
• R3: Headlight Low Beam Relay
• R4: Headlight High Beam Relay
• R5: Ignition Relay
• R6: Blower Motor Relay
• R7: A/C Clutch Relay

Dash Fuse Box (Cabin Fuse Box)

This fuse box is typically located on the passenger side, behind a kick panel or under the dashboard. It protects interior accessories, cabin lighting, and various control modules.

Relay Locations (Dash):

• R1: Accessory Relay
• R2: Power Window Relay

Sleeper/Cabin Fuse Box (Rear Cabin/Sleeper Area)

Some International LT models, especially those with extensive sleeper amenities, will have an additional fuse box located in the sleeper area. This box typically covers accessories specific to the sleeper, such as additional power outlets, lighting, and entertainment systems.

Relay Locations (Sleeper/Cabin):

• R1: Sleeper Accessory Relay

How to Test a Fuse

1. Safety First: Turn off the ignition and any affected circuits. Remove the key for added safety.
2. Locate the Fuse Box: Refer to your owner's manual or the quick answer section above to find the correct fuse box.
3. Identify the Suspect Fuse: Look at the fuse box diagram (usually under the lid or in the manual) to find the fuse for the component that isn't working.
4. Visual Inspection: Most automotive fuses are clear, allowing you to see the small wire inside. If this wire is broken or melted, the fuse is blown. Tinted fuses may require removal.
5. Use a Fuse Tester or Multimeter:
   • Fuse Tester: Many fuse boxes have small test points on the top of each fuse. Touch a fuse tester to these points. If the light illuminates on both sides, the fuse is good. If it only lights on one side or not at all, the fuse is blown.
   • Multimeter: Set your multimeter to the ohms (Ω) or continuity setting. Remove the fuse from its slot. Touch the multimeter probes to each metal blafe of the fuse. A good fuse will show very low resistance (close to 0 ohms) or beep if it has a continuity function. A blown fuse will show infinite resistance (OL) or no beep.
6. Replace (If Blown): Always replace a blown fuse with a new one of the exact same amperage (A) rating and type. Using a fuse with a higher rating can lead to serious electrical damage or fire.

Common Blown Fuses on This Vehicle

On a heavy-duty truck like the 2024 International LT, some fuses might be more prone to blowing due to the demands placed on certain systems. Here are some common ones and what to check first:

• Cigar Lighter / 12V Outlets (Dash/Sleeper): These fuses (often 15A or 20A) frequently blow due to overloads from charging multiple devices or using high-power accessories. Check the devices you have plugged in; disconnect any that might be drawing too much power.
• A/C Blower Motor (Cabin Fan): The blower motor fuse (often 20A-30A) can blow if the motor is working too hard due to a clogged cabin air filter, a failing motor, or an obstruction in the blower assembly. Check your cabin air filter first.
• Trailer Brake Controller Power / Trailer Marker Lights: Fuses related to trailer electrical systems (often 20A-30A for power, 15A for marker lights) can blow due to shorts in the trailer wiring, faulty trailer lights, or an issue with the trailer brake controller itself. Inspect your trailer's wiring connections and lights.
• Headlights (Low/High Beam): While less common with modern LED lighting, traditional halogen headlights could blow fuses (15A) due to bulb failure or wiring issues. If one headlight is out, first check the bulb.
• Radio / Infotainment System: These fuses (10A-15A) can sometimes blow if there's a short in the wiring, a fault within the head unit, or if aftermarket accessories are incorrectly wired. If your radio is completely dead, check this fuse.

Always remember to consult your truck's specific owner's manual for the most accurate fuse box diagrams and troubleshooting steps. If you're unsure or facing recurring electrical issues, it's best to consult a certified technician.

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