2021 International MV Bulb Size Guide

Quick Reference Bulb Size Chart: 2021 International MV

Note: The 2021 International MV primarily uses halogen and incandescent bulbs from the factory. Some higher trim levels or optional packages may feature factory-installed LED lighting, which typically requires replacing the entire housing unit rather than just a bulb. Always double-check your existing bulbs before purchasing replacements.

LED vs. Halogen Upgrade Considerations

Upgrading your 2021 International MV to LED bulbs can significantly improve visibility and give your truck a more modern look. However, there are a few important factors to consider before making the switch:

• CANBUS Errors: The MV's computer system (CANBUS) monitors the electrical current of your lighting system. Since LEDs draw less power than halogens, the system might mistakenly think a bulb is burnt out, leading to a "bulb out" warning on your dashboard. To prevent this, you'll likely need to install CANBUS-compatible LED bulbs or add an external resistor to mimic the load of a halogen bulb.
• Adapter Plates: For the H11 low beam headlights, you may need an adapter plate to securely fit the new LED bulb into the headlight housing. The locking mechanism on some LED bulbs doesn't always match the stock housing perfectly.
• Beam Pattern: It is crucial to select LED replacement bulbs that are designed to replicate the filament placement of the original halogen bulbs. This ensures a proper beam pattern that illuminates the road effectively without glaring into the eyes of oncoming drivers. Poorly designed LEDs can create dangerous dark spots and uncontrolled glare.

How to Replace Each Bulb

Here are some quick tips for accessing and replacing the bulbs on your 2021 International MV:

• Headlights (Low and High Beam): Access is typically gained from behind the headlight assembly inside the engine bay. You may need to remove a dust cover. The bulbs usually twist and lock into place. Disconnect the electrical harness, twist the old bulb counter-clockwise to remove, and install the new one by doing the reverse.
• Fog Lights: These are located in the lower front bumper. Access is usually from underneath the front of the truck or by removing a small panel in the wheel well.
• Front Turn Signals: Located within the main headlight assembly, these are accessed similarly to the headlights from the rear of the housing.
• Rear Turn Signal, Brake, and Tail Lights: These are housed in the rear tail light assembly. You'll typically need to remove a few screws or bolts from the outside of the lens to pull the entire assembly away from the truck body, giving you access to the bulbs on the back.
• Reverse Lights: Also located in the rear tail light assembly, these are replaced in the same manner as the brake and turn signal bulbs.
• License Plate and Side Marker Lights: These small bulbs are usually held in a small housing that can be popped out with a flathead screwdriver or trim removal tool. Give the bulb holder a quarter-turn to remove and replace the bulb.
• Interior Dome/Map Lights: The plastic cover for these lights can usually be gently pried off with a small, flat tool. The bulb can then be pulled directly out and a new one pushed in.

Common Lighting Issues for this Generation

While the 2021 International MV is a robust truck, some common lighting issues can arise:

• Connector Corrosion: Due to the nature of their work environment, these trucks are exposed to a lot of moisture and road salt, which can lead to corrosion on bulb sockets and wiring connectors. This can cause intermittent flickering or complete failure of a light. Cleaning the contacts or replacing the connector harness is often the solution.
• Voltage Spikes: Heavy-duty trucks can sometimes experience voltage fluctuations from the alternator, which can shorten the lifespan of standard incandescent bulbs. If you find yourself replacing the same bulb frequently, this could be the culprit.
• Vibration Damage: The constant vibration of a commercial truck can cause the filaments in traditional halogen and incandescent bulbs to fail prematurely. Upgrading to LED bulbs, which have no delicate filament, is an excellent way to mitigate this issue as they are far more resistant to vibration.

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