2017 Ford F-350 Super Duty Bulb Sizes

Quick reference

The 2017 Ford F-350 Super Duty offers a mix of lighting technologies depending on the trim level and optional packages. While many lower and mid-trim models came standard with traditional halogen bulbs, higher trims and specific option packages could include factory LED or HID (High-Intensity Discharge) lighting for the headlights and sometimes other exterior lights. It's important to check your specific vehicle's configuration before purchasing replacement bulbs.

For vehicles equipped with OEM LED or HID headlights, the individual bulbs for low and high beams are often integrated into the headlamp assembly and are not designed to be individually replaced. If an LED or HID component fails in these assemblies, the entire headlamp unit typically needs to be replaced. Always verify your vehicle's exact setup.

LED vs Halogen upgrade considerations

Upgrading from halogen to LED bulbs in your 2017 F-350 Super Duty can offer significant benefits, including brighter light, a whiter color temperature, and longer lifespan. However, there are several considerations to keep in mind:

• CANBUS Errors: Modern vehicles like the F-350 Super Duty use a CANBUS (Controller Area Network Bus) system to monitor various electrical components, including lighting. LED bulbs draw significantly less power than halogen bulbs, which can sometimes lead the CANBUS system to detect a "bulb out" error, triggering a warning light on your dashboard or causing hyper-flashing for turn signals. To prevent this, you'll often need to use CANBUS-compatible LED bulbs or install load resistors in parallel with the LED bulbs for front and rear turn signal applications. Load resistors mimic the electrical load of a halogen bulb, tricking theBUS system.
• Adapters Needed: For some LED headlight upgrades, you might need specific mounting adapters or retainer clips to properly secure the LED bulb into the headlight housing. The base of an LED bulb can sometimes differ slightly from a halogen counterpart, even if the bulb size (e.g., H13) is technically the same.
• Beam Pattern and Glare: The optical design of a headlight housing is engineered for the specific light output pattern of its original bulb type (halogen, LED, or HID). Installing an LED bulb into a housing designed for halogen can sometimes result in an unfocused beam pattern, reduced light on the road, or excessive glare for oncoming drivers. It's crucial to choose high-quality LED bulbs designed to closely mimic the filament placement of their halogen equivalent and to properly aim your headlights after installation.
• Heat Dissipation: LEDs generate heat, but unlike halogens that project heat forward, LEDs dissipate it backward. High-performance LED bulbs incorporate cooling fans or large heat sinks. Ensure there is adequate space behind the headlight assembly for proper heat dissipation to prevent premature LED failure.

How to replace each bulb

• Low Beam/High Beam (Halogen H13): Access is usually from the rear of the headlight assembly. Twist the bulb counter-clockwise to remove. Disconnect the electrical connector, then install the new bulb, ensuring it's properly seated before twisting clockwise to lock.
• Fog Light (H10/9145): Often accessible from underneath the front bumper or by reaching through the wheel well liner. Twist to remove the bulb, disconnect the connector, and replace.
• DRL (4257NAK), Front Turn Signal (3157/4157NAK): Access is typically from behind the headlight assembly. Twist the socket counter-clockwise, pull it out, and then carefully pull the bulb straight out of the socket. Push the new bulb in firmly.
• Rear Turn Signal, Brake Light, Tail Light (3157): Access the rear of the taillight assembly by removing a few screws or clips (often accessible from inside the truck bed or by opening the tailgate). Twist the socket counter-clockwise, remove the old bulb, and insert the new one.
• Reverse Light (921): Similar to the rear turn/brake/tail lights, access is from the rear of the taillight assembly. Twist the socket, pull the old bulb straight out, and push the new one in.
• License Plate (194/W5W): These are usually in a small housing above the license plate. Often, you can pop off the lens cover or twist the socket assembly to access the bulb.
• Side Marker (194/W5W): These are typically integrated into the headlight or taillight assembly. The bulb socket can usually be twisted out from the rear of the assembly.
• Dome/Map Lights (578/212-2/194): Gently pry off the clear lens cover with a plastic trim tool or small screwdriver. Be careful not to damage the plastic. The bulbs are usually push-in or festoon-style (ends fit into clips).

Common lighting issues for this generation

For the 2017 Ford F-350 Super Duty, common lighting issues are generally related to bulb lifespan and electrical connections rather than widespread design flaws.

• Bulb Burnout: Halogen bulbs have a finite lifespan. Frequent burnouts could indicate voltage fluctuations or excessive vibration, though this is less common for an F-350. Using quality replacement bulbs is key.
• Corrosion in Sockets: Especially for exterior lights exposed to the elements, corrosion can build up in bulb sockets, leading to intermittent operation or complete failure. Cleaning sockets with electrical contact cleaner and a small brush can resolve this.
• Trailer Wiring Harness Issues: Owners who frequently tow may experience issues with trailer lights not working correctly. This is often due to corrosion in the trailer wiring harness connector, a blown fuse specific to the trailer circuit, or problems with the trailer itself, not necessarily the truck's internal lighting system.
• DRL Module Malfunction: In some cases, issues with the Daytime Running Light module can lead to DRLs not functioning correctly. This is less common but can occur.
• CANBUS Related Errors after LED Upgrade: As mentioned previously, if you upgrade to aftermarket LED bulbs without proper CANBUS decoders or load resistors, you will likely encounter "bulb out" warnings or hyper-flashing turn signals.

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