The typical headlight bulb sizes for a 2017 Kenworth T680 are H11 for the low beam and 9005 for the high beam. This is the most common factory configuration for the model, but exact sizes can vary by trim, market, or aftermarket headlamp setup.
In practice, the 2017 T680 uses a dual-headlamp system with separate bulbs for low and high beams. While H11 and 9005 cover the majority of builds, some trucks may use different bulb types due to regional specifications or aftermarket replacements. Always confirm by checking the current bulb in the headlamp housing or consulting the owner’s manual for your exact VIN and build.
Common bulb sizes for the 2017 Kenworth T680
Below are the sizes you’re most likely to encounter with the stock headlight assemblies on a 2017 T680. Use this as a starting point, then verify on your vehicle.
- Low beam: H11
- High beam: 9005 (HB3)
Note that if your truck has been upgraded or retrofitted with LED or HID headlights, the bulb sizes may differ or the assembly may use non-standard modules. Always verify by inspecting the actual bulbs or checking the headlight model number.
Notes for variations and safe replacement
If you’re unsure, consult your dealer or reference the headlight housing label, which often lists compatible bulb types. When replacing bulbs, avoid touching the glass with bare hands, use clean gloves or a cloth, and replace bulbs in matched pairs when possible to maintain consistent light output and color.
Summary
For most 2017 Kenworth T680 trucks with standard halogen headlights, the recommended bulbs are H11 for the low beam and 9005 for the high beam. Always confirm with the owner’s manual or by inspecting the installed bulbs, as regional variants or aftermarket headlamps can change the required sizes. If you’re upgrading to LEDs or HIDs, expect different bulb types and installation steps.