2019 International LT Fuse Box Diagram

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Quick answer

On the 2019 International LT, the primary fuse box and relays are located inside the cab, on the passenger side. You can access it by removing the kick panel or lower dash panel in that area. High-amperage fuses and additional relays are housed in the Power Distribution Module (PDM), typically mounted on the driver's side of the firewall in the engine compartment.

• Main Fuse Panel: Located in the passenger-side dash/kick panel area.
• Power Distribution Module (PDM): Located under the hood, on the driver's side firewall.

Important Note: Fuse layouts can vary based on the truck's specific configuration and optional equipment. Always verify fuse and relay locations by checking the diagram printed on the inside of the fuse box cover for your specific vehicle.

Main Fuse Panel (Passenger Dash)

This panel contains the majority of fuses for the cab and chassis electronic systems.

Relay Locations (Passenger Dash Panel)

• R1: Starter Relay
• R2: Ignition Main Relay
• R3: Blower Motor Relay
• R4: A/C Clutch Relay
• R5: Trailer Marker Lights Relay
• R6: Park Lamp Relay

Power Distribution Module (PDM) - Under Hood

This box handles the high-current circuits for the truck's primary systems.

How to test a fuse

A blown fuse can cause an electrical component to stop working suddenly. Testing a fuse is a simple diagnostic step you can do yourself.

1. Visual Inspection (The Easy Way)

• Locate the suspect fuse in the panel.
• Remove the fuse using a fuse puller (often included on the fuse panel cover) or a pair of needle-nose pliers. Be careful not to rock it too much, just pull straight out.
• Hold the fuse up to the light. Inside the plastic body, you will see a small metal S-shaped wire. If this wire is broken or looks burnt, the fuse is blown and needs to be replaced.
• If the wire is intact, the fuse is likely good.

2. Using a Multimeter (The Pro Way)

• Set your multimeter to the "Continuity" setting. It often looks like a sound wave symbol.
• With the fuse removed from the vehicle, touch one probe of the multimeter to each of the two metal blades on the top of the fuse.
• If the multimeter beeps or shows a reading of zero (or very close to zero), it means the circuit is complete, and the fuse is good.
• If the multimeter is silent and reads "OL" (Open Line) or "1", the fuse is blown.

Important: When replacing a fuse, always replace it with a new fuse of the exact same amperage rating. Using a higher-rated fuse can cause a fire hazard by allowing too much current through the circuit.

Common blown fuses on this vehicle

The 2019 International LT is a workhorse, and some circuits see more wear and tear than others.

• Fuse F1/F2 (Cigar Lighter / 12V Outlet): This is one of the most common fuses to blow. It is often caused by a faulty phone charger, a loose plug, or trying to power a device that draws too much current. Before replacing the fuse, unplug everything from the outlets and inspect them for debris or damage.

• Fuse F14/F16 (Trailer Lights): Trailer wiring is a frequent source of electrical problems. A short in the trailer's wiring, a corroded trailer plug, or water getting into a light housing can easily blow the marker or turn signal fuses. If these fuses blow, the first thing you should check is the trailer wiring and plug connection, not the truck itself.

• Fuse F18 (Blower Motor): If your main HVAC fan suddenly quits, this fuse is the first place to look. If it has blown, it could be a sign that the blower motor is aging and starting to draw too much current. If the new fuse blows immediately or soon after, you may need to have the blower motor and its resistor inspected.

If you find yourself repeatedly replacing the same fuse, it indicates an underlying short circuit or a component drawing too much power. This issue should be professionally diagnosed to prevent further damage.

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