2015 Ford F-350 Super Duty Bulb Size Guide: Headlight, Tail, Fog & More

As an ASE-certified master technician, I have seen countless Ford Super Duty trucks roll through the shop doors. The 2015 Ford F-350 Super Duty is an absolute workhorse, but like any heavy-duty truck that sees long hours on the road, its lighting system requires regular maintenance. Whether you are replacing a burnt-out tail light, upgrading your low beams for better nighttime visibility while towing, or outfitting your cab with brighter interior lights, knowing the exact bulb size is your first step.

Below is a comprehensive guide to the 2015 Ford F-350 Super Duty bulb sizes, along with professional advice on making upgrades.

Quick Reference: 2015 Ford F-350 Bulb Sizes

Here is the complete bulb size chart for the standard 2015 Ford F-350 Super Duty. Keep in mind that while most trims (XL, XLT, Lariat) use standard halogen setups, some heavily optioned or Platinum models may feature different OEM housings.

*Note: Reverse light sizes can vary slightly depending on the specific bed and tail light housing type (styleside vs. chassis cab). 3156 is standard for the factory styleside bed.

LED vs Halogen Upgrade Considerations

Upgrading the F-350’s factory halogen bulbs to LEDs is one of the most popular modifications, providing a massive boost in visibility and a modern look. However, Ford’s electrical systems can be particular:

• CANBUS Errors & Hyperflashing: The 2015 Super Duty uses an advanced Smart Junction Box (SJB). If you install LEDs in the turn signals (3157), the truck will detect the lower power draw and trigger "hyperflashing" (rapid blinking). To fix this, you will need to install inline load resistors or purchase LED bulbs with built-in CANBUS decoders.
• Headlight Flickering: Installing H13 LED headlight bulbs can sometimes result in flickering or the lights shutting off randomly due to the SJB's pulse-width modulation (PWM) system used for the DRLs. An anti-flicker harness (PWM decoder) is highly recommended for LED headlight upgrades.
• Housing Limitations: The factory H13 reflector housings are designed to scatter light from a halogen filament. When buying LED H13 bulbs, ensure they perfectly mimic the halogen filament placement, or you will blind oncoming drivers with scattered glare.

How to Replace Each Bulb

• Headlights (Low/High): Ford made this relatively easy. Open the hood and remove the retaining bolts on the top of the headlight assembly. Carefully pull the housing forward (it may require a firm tug to release the lower clips). Unplug the connector, twist the H13 bulb counterclockwise, and pull it out.
• Fog Lights: Crawl under the front bumper. The back of the fog light housing is completely exposed. Simply pinch the connector tab, pull down to unplug it, and twist the 9140 bulb out of the housing.
• Tail, Brake, Turn, and Reverse Lights: Drop the tailgate and locate the two 8mm bolts on the inside lip of the bed next to the tail light. Remove them and pull the entire tail light assembly straight back. All rear bulbs (3157 and 3156) are accessible via simple twist-lock sockets.
• Cab Clearance / Marker Lights: Remove the screws holding the amber lens to the roof. Gently lift the lens, pull the old 194 bulb straight out, and push the new one in. Make sure the gasket is seated properly before tightening to prevent water leaks.

Common Lighting Issues for this Generation

1. Melted Headlight Pigtails: The factory H13 connectors on the 2011-2016 Super Duty are notorious for melting if higher-wattage aftermarket halogen bulbs are installed, or if the connection becomes loose and arcs. If your headlight goes out and the bulb looks fine, inspect the plastic connector for melting or scorching. You may need to splice in a new ceramic pigtail.
2. Water Intrusion in Tail Lights: It is very common for the seals around the factory tail lights to degrade over time, leading to condensation. This causes premature bulb failure and corroded sockets. If you notice pooling water, drill a tiny weep hole at the bottom of the lens or replace the housing entirely.

If you are dealing with persistent electrical gremlins or want a professional to install a complex LED/HID projector retrofit, do not risk damaging your truck's Smart Junction Box. Find a trusted shop on Repairius.