Kenworth Bulb Size Guide

Check the headlight housing and the original bulb. Halogen systems usually use replaceable bulbs such as H11, 9005, 9007, or sealed-beam lamps. HID systems use HID bulbs such as D1-S with a ballast. LED systems may use integrated modules or full headlight assemblies.

If the headlight has no removable bulb, it may be a factory LED or aftermarket LED assembly.

Many Kenworth halogen bulbs can be upgraded to LED replacement bulbs, but the LED must match the original bulb size and fit the headlight housing correctly.

Before installing LED bulbs in a Kenworth truck, check bulb size, heat sink clearance, dust cap space, connector fitment, beam pattern, and whether the truck needs anti-flicker support.

Not always. Some Kenworth headlights use separate low beam and high beam bulbs, while other setups use a dual-function bulb or sealed-beam lamp.

Some Kenworth LED headlights do not use standard replacement bulbs. Factory LED and aftermarket LED headlight assemblies may use integrated LEDs, service modules, or complete assembly replacement.

If your Kenworth has LED headlights, check the assembly service information before ordering halogen-style bulbs.