2022 International LT — Fuse Box Diagram & Amperage

Quick Answer

The 2022 International LT typically features three main fuse box locations:

• Under-hood: Located on the driver's side, often near the firewall or battery box. This box handles many primary power distribution and high-current circuits.
• Dash Kick-Panel (Driver's Side): Situated behind a removable panel on the driver's side kick panel, this box manages various cabin electrical functions, accessories, and some control modules.
• Battery Box / Chassis (Right Side Frame Rail): Often molded into the battery box or mounted on the frame rail on the passenger's side, this box houses dedicated fuses/relays for the engine, aftertreatment system, and battery-related circuits.

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Under-Hood Fuse Box

The under-hood fuse box generally contains fuses and relays for critical powertrain components, lighting, and other high-current systems. Always refer to the fuse diagram printed on the inside of the fuse box cover for the exact layout and amperage ratings, as these can vary slightly by trim and installed options.

Fuse #	Amp	Color	Circuit / Component Protected
F1	20A	Yellow	ECM (Engine Control Module) - Main Power
F2	15A	Blue	Fuel Pump Relay Control
F3	30A	Green	ABS (Anti-lock Brake System) - Main Power
F4	25A	Natural	Ignition Switch - Main Power
F5	40A	Green	Blower Motor - HVAC
F6	15A	Blue	Headlight (Low Beam) - Left
F7	15A	Blue	Headlight (Low Beam) - Right
F8	10A	Red	Headlight (High Beam) - Left
F9	10A	Red	Headlight (High Beam) - Right
F10	10A	Red	Tail Lights / Marker Lights
F11	20A	Yellow	Starter Relay Control
F12	10A	Red	A/C Clutch Relay Control
F13	30A	Green	Trailer Brake Controller - Main Power
F14	20A	Yellow	Wiper Motor
F15	15A	Blue	Horn
F16	10A	Red	Turn Signals / Hazard Lights

Common Relays in this box include:

• Ignition Relay: Powers various systems when the ignition is on.
• Fuel Pump Relay: Supplies power to the fuel pump.
• Starter Relay: Engages the starter motor.
• Headlight Relays: Control high and low beam headlights.
• Blower Motor Relay: Controls the HVAC blower motor.
• ABS Relay: Powers the ABS system.

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Dash Kick-Panel Fuse Box (Driver's Side)

This interior fuse box provides power to many of the vehicle's accessories, cabin electronics, and control modules. The exact location is usually behind a removable panel on the driver's side kick panel, next to the footrest.

Fuse #	Amp	Color	Circuit / Component Protected
F1	10A	Red	Radio / Infotainment System
F2	15A	Blue	Instrument Cluster
F3	20A	Yellow	Cigar Lighter / 12V Power Outlet (Dash)
F4	10A	Red	Interior Cabin Lights
F5	5A	Tan	Airbag (SRS) Module - Keep Alive Power
F6	15A	Blue	HVAC Control Module
F7	10A	Red	Power Windows - Driver's Side
F8	10A	Red	Power Windows - Passenger's Side
F9	10A	Red	Power Mirrors
F10	15A	Blue	Central Locking System
F11	5A	Tan	Diagnostic Link Connector (DLC)
F12	10A	Red	USB / Auxiliary Power Port
F13	15A	Blue	Driver Information Display
F14	20A	Yellow	Accessory Power Outlet (Sleeper/Mid-Cab)
F15	5A	Tan	Brake Pedal Position Switch

Common Relays in this box include:

• Accessory Delay Relay: Powers accessories for a short period after the ignition is turned off.
• Interior Light Relay: Controls cabin lighting.

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Battery Box / Chassis Fuse Box (Right Side Frame Rail)

This fuse box, often integrated into the battery box or mounted on the chassis frame rail, is specifically designed to protect circuits directly related to battery power distribution, engine primary power, and often the aftertreatment system due to their high current demands.

Fuse #	Amp	Color	Circuit / Component Protected
F1	50A	Red	Main Battery Feed - Engine ECM
F2	40A	Green	Aftertreatment System (DEF Heater / Doser)
F3	30A	Green	Master Disconnect Switch Control
F4	20A	Yellow	Chassis Power - Auxiliary / Upfitter
F5	15A	Blue	ABS Module - Secondary Power
F6	10A	Red	Battery Sensor Module
F7	10A	Red	ECM Ignition Live (Wake-up)
F8	20A	Yellow	Trailer ABS Power
F9	15A	Blue	Park Brake Solenoid
F10	10A	Red	Chassis Ground Fault Detection

Common Relays in this box include:

• Master Disconnect Relay: Controls the main power cut-off for the vehicle.
• Aftertreatment System Relay: Powers various aftertreatment components.
• Engine ECM Power Relay: Provides primary power to the engine control module.

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How to Test a Fuse

Testing a fuse is a straightforward process that can help you diagnose electrical issues. Here's how to do it:

1. Safety First: Always turn off the ignition and remove the key to prevent accidental shocks or short circuits.
2. Locate the Fuse Box: Identify the fuse box relevant to the circuit you're troubleshooting.
3. Identify the Suspect Fuse: Consult the fuse diagram on the lid or in your owner's manual to find the fuse for the problematic component.
4. Visual Inspection: Most modern fuses have a visible wire element inside. If this wire is broken or charred, the fuse is blown. Some fuses may appear intact, however, but still be blown.
5. Use a Fuse Tester or Multimeter:
   • Fuse Tester: A simple fuse tester lights up if the fuse is good. Touch the probes to the test points on top of the fuse. If it lights up, the fuse is good. If not, it's blown.
   • Multimeter: Set your multimeter to the continuity or ohms setting. Remove the suspect fuse from its slot. Touch one probe to each metal blade of the fuse. A good fuse will show very low resistance (close to zero ohms) or indicate continuity (often with a beep). A blown fuse will show an open circuit (OL or infinite resistance).
6. 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-rated fuse can cause serious electrical damage or fire.

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Common Blown Fuses on this Vehicle

While any fuse can blow, some circuits are subject to more wear and tear or higher loads, making their fuses more prone to failure. On a 2022 International LT, common blown fuses often include:

• Cigar Lighter / 12V Power Outlets (Dash/Sleeper): These fuses often blow due to overloading from charging multiple devices, using high-power accessories, or short circuits from foreign objects inserted into the outlet. If your charging ports aren't working, check these first (typically F3 in the Dash Kick-Panel box, and F14 if a sleeper accessory outlet).
• Headlights / Tail Lights: While modern trucks have robust lighting systems, issues like faulty bulbs, wiring chafing, or even trailer light shorts can sometimes trip these fuses (F6-F10 in the Under-Hood box). If you lose one side of your headlights or all tail lights, check here.
• Blower Motor: The HVAC blower motor (F5 in the Under-Hood box) draws significant current. A failing blower motor, a clogged cabin air filter causing the motor to work harder, or wiring issues can lead to this fuse blowing. If your fan isn't working on any speed, start here.
• Trailer Brake Controller: Given the heavy-duty nature of the International LT, the trailer brake controller's main power fuse (F13 in the Under-Hood box) can blow due to issues within the trailer's electrical system or a short in the wiring to the trailer. If your trailer brakes aren't responding, check this fuse first.
• ECM/PCM Fuses: While less common to blow without significant underlying issues, a blown ECM (F1 in the Under-Hood box or F1/F7 in the Battery Box) or PCM fuse can lead to a no-start condition or various engine performance problems. If the truck won't start or runs erratically, and you've checked other basics, inspect these critical fuses. Always consult a professional if these fuses repeatedly blow.

Always remember to check the simplest solutions first when troubleshooting electrical problems. A blown fuse often points to an underlying issue, so if a fuse blows repeatedly, consult a qualified technician to diagnose the root cause.

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