2020 International MV Bulb Size Guide: Headlights, Tail Lights & More

As an ASE-certified master technician, I know that keeping a medium-duty workhorse like the 2020 International MV on the road means minimizing downtime. A burnt-out headlight or marker light can lead to a failed DOT inspection and lost revenue. Because the International MV series is highly customizable for different fleet needs (from box trucks to dump trucks and tow rigs), lighting configurations can vary. Many fleets spec standard halogen composite housings for cost savings, while others opt for factory-sealed LED units for longevity.

Below is the definitive bulb size guide for your 2020 International MV to help you get the right parts the first time.

Quick Reference: 2020 International MV Bulb Sizes

Note: Depending on your specific upfitter and factory build sheet, your rear lighting may consist of standard fleet 4-inch round or 6-inch oval sealed LED modules rather than replaceable incandescent bulbs.

LED vs Halogen Upgrade Considerations

Upgrading the halogen bulbs on an International MV to LEDs is a popular choice for fleet managers looking to improve nighttime visibility and reduce maintenance intervals. However, there are a few important considerations:

• CANBUS Systems and Hyper-Flashing: Modern commercial trucks utilize complex body control modules (BCMs). If you install aftermarket LED turn signal bulbs in a halogen housing, the system will detect a lower voltage draw and trigger a "hyper-flash" or a bulb-out warning on the dash. You will need load resistors or CANBUS-ready LED bulbs to bypass this.
• Beam Pattern: Dropping an LED bulb into a standard H11/H9 halogen composite housing can scatter light and blind oncoming drivers. Ensure you purchase LEDs specifically designed to mimic the halogen filament placement.
• Sealed Upgrades: Instead of replacing just the bulb, many owners upgrade the entire composite headlight housing or the rear 4-inch round tail light buckets to completely sealed LED assemblies (like Truck-Lite or Grote). These are DOT-compliant and practically bulletproof against vibration.

How to Replace Each Bulb

Working on a commercial truck offers a bit more clearance than a passenger car, but you still need to know where to look.

• Headlights (Low/High/Front Turn): The International MV features a tilt hood. Unlatch and tilt the hood forward. The rear of the headlight assemblies will be fully exposed, offering incredibly easy access. Simply twist the dust cap counterclockwise, disconnect the wiring harness, and twist the H11 or H9 bulb out.
• Fog Lights: Located in the lower bumper, you can typically reach these directly from underneath the front bumper. Twist to remove.
• Cab Roof / Side Markers: These require a ladder or step. Remove the two Phillips screws holding the amber lens in place, pull the lens off, and pull the 194 bulb straight out of its socket. (Many fleets spec sealed LED markers, which require replacing the entire small unit).
• Rear Tail / Brake / Reverse: Depending on your upfitter (e.g., Morgan box, flatbed), rear lights are usually housed in rubber grommets. If they are replaceable incandescent bulbs, remove the screws on the lens. If they are sealed 4-inch round LEDs, simply pry the light assembly out of the rubber grommet with a flathead screwdriver and unplug the 3-prong pigtail connector in the back.
• Interior Dome Lights: Use a plastic trim tool to pry the clear plastic cover off the overhead console. The festoon (211-2) or 194 bulbs pull straight out.

Common Lighting Issues for This Generation

The 2020 International MV is built tough, but commercial environments are brutal on electrical systems.

• Corroded Pigtails: The rear tail lights and side markers are highly susceptible to road salt and moisture. If a bulb replacement doesn't fix your light, check the 3-prong pigtail connector for green corrosion. Packing connectors with dielectric grease during bulb changes is a highly recommended preventative measure.
• Vibration Failures: Heavy duty diesel engines and rough job sites mean severe vibration. Standard halogen filaments break frequently under these conditions. If you find yourself replacing bulbs every few months, it is time to upgrade to shock-resistant LEDs.
• Headlight Condensation: The composite factory headlight housings can sometimes develop seal leaks, causing internal condensation. This will prematurely burn out your H11 and H9 bulbs. If the housing is heavily fogged, replace the entire assembly.

Maintaining proper lighting on your commercial vehicle is crucial for safety and compliance. If you are dealing with persistent electrical gremlins, harness issues, or need complex upfitter lighting repaired, leave it to the professionals. Find a trusted shop on Repairius.