2019 Ford F-350 Super Duty Bulb Size Guide

This guide covers all the essential bulb sizes for your 2019 Ford F-350 Super Duty, from headlights to interior dome lights. Understanding these sizes is crucial for DIY replacements or when planning upgrades to LED or HID systems.

Quick Reference Bulb Size Chart

Ford offered both halogen and LED factory lighting on the 2019 F-350, depending on the trim level (XL, XLT, Lariat, King Ranch, Platinum, Limited). Halogen reflector units were standard on lower trims, while premium trims featured full LED assemblies. This table provides bulb sizes for the halogen models and notes where LEDs were a factory option.

LED vs. Halogen Upgrade Considerations

Upgrading your 2019 F-350's halogen bulbs to aftermarket LEDs is a popular choice for improved visibility and a modern look. However, there are a few key things to consider:

• CANBUS Errors: Ford trucks, particularly in this generation, have sensitive computer systems (CANBUS) that monitor bulb function. An LED bulb draws less power than a halogen, which can trick the system into thinking the bulb is burned out. This often results in a "fast flash" on turn signals or a "bulb out" warning on the dashboard. To fix this, you will likely need to install "CANBUS-ready" LEDs, which have built-in resistors, or wire in an external resistor for each bulb.
• Adapters and Fitment: While the bulb base may be an H11 or 9005, the larger heat sink or fan on the back of an LED bulb can sometimes interfere with the headlight housing's dust cover. Ensure you choose LEDs with a compact design or be prepared to modify or replace the dust cover. Some kits may require specific adapters for a secure fit in the housing.
• Beam Pattern: It is critical to choose high-quality LED bulbs designed to mimic the filament placement of the original halogen bulb. Placing a poorly designed LED into a halogen reflector housing can scatter light everywhere, creating glare for oncoming drivers and reducing effective visibility, even if the light seems "brighter." Look for LEDs with adjustable collars to help fine-tune the beam pattern.

How to Replace Each Bulb

Replacing bulbs on the F-350 is generally straightforward.

• Headlights: Access is gained from behind the headlight assembly inside the engine bay. Twist the bulb socket counter-clockwise, pull it out, replace the bulb (avoid touching the glass on halogens), and re-insert.
• Fog Lights: These are typically accessed from the front by removing a small plastic trim piece or from behind via the wheel well liner.
• Tail Lights & Rear Bulbs: To access the rear bulbs, lower the tailgate and remove the two bolts on the inside of the truck bed holding the tail light assembly. Carefully pull the entire housing straight back to release it from its clips. The bulb sockets twist out from the back of the assembly.
• License Plate & Cargo Lights: These small bulbs can usually be accessed from the outside. The license plate light housings are often held by clips or a single screw. The high-mount cargo light assembly is removed with a couple of screws.
• Interior Bulbs: Use a plastic trim removal tool to gently pry off the clear plastic lens covers for the dome and map lights. This will prevent scratching or breaking the plastic. The bulbs can then be pulled straight out or unclipped.

Common Lighting Issues for this Generation

• Moisture in Headlights: Some owners have reported condensation forming inside the large factory headlight assemblies, both halogen and LED. If this happens, it may indicate a bad seal on the housing itself or a dust cover that wasn't properly re-seated after a bulb change.
• Hyper-Flash (Fast Blinking): As mentioned, this is the most common issue after installing aftermarket LED turn signal bulbs without the necessary resistors to correct the load difference.
• BLIS Faults: On trims equipped with the Blind Spot Information System (BLIS), the sensors are located in the tail light assemblies. Using low-quality LED bulbs in the tail lights can sometimes cause electromagnetic interference, leading to a BLIS fault warning. Always use high-quality, EMI-shielded LEDs if upgrading.

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