Halogen Headlight Assembly, Driver Side, for Kenworth T680 (2013-2021) - P54-6164-100

If you're shopping for a Kenworth T680 headlight that's actually going to bolt up right, here's the driver side (left) halogen headlight assembly for 2013-2021 Kenworth T680 trucks, part number P54-6164-100. It's a chrome-housed, clear-lens unit built to match the factory halogen headlight setup, so you're not stuck cutting wires or modifying brackets just to get it to sit in the opening.

Read this before you buy: this headlight is compatible with the factory halogen headlight model only. It is not compatible with the LED DRL (daytime running light) headlight package that some T680s left the factory with. The housing, the internal electronics, and the way the two setups handle the daytime running lights are different, and there's no way to make an LED DRL truck work with a halogen-spec assembly without ending up with mismatched lighting on the front of the truck. Take a minute, look at the light currently on your truck (or check your build sheet), and confirm you've got the halogen version before you place the order. On a commercial truck sitting in a fleet, that five minutes of checking saves you a return shipment and downtime.

Built Specifically for the 2013-2021 Kenworth T680, Halogen Trucks

This assembly covers the 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, and 2021 model years of the Kenworth T680, and it's a direct fit for the driver side only — meaning no drilling, no re-wiring, no trimming the harness to make it work. It goes in where the factory unit came out. Keep in mind, though, that this listing is for one headlight, the left/driver side. It does not include the passenger side unit, so if you need both sides replaced, you'll want to order two, or reach out to us through the request a part page if you're trying to track down the matching passenger side for a fleet vehicle and aren't sure which one fits.

What's Actually Inside This Kenworth T680 Headlight

The housing is chrome, the lens is clear, and it's finished to give a factory look rather than an aftermarket one — something a lot of fleet managers and owner-operators care about more than they'd admit. The lens itself is injection-molded polycarbonate, the same general lens technology that trickled down from aerospace applications, and it's UV-treated to resist the yellowing and clouding that cheaper lenses develop after a couple of summers on the road. It's also built to handle impacts better than a basic glass or unprotected plastic lens would, which matters on a truck that's picking up gravel and debris at highway speed every day.

Inside, there are load resistors built into the assembly. Their job is to stop the electrical gremlins that show up when you swap a headlight on a modern truck — hyperflashing, bulb-out warnings, or random error codes on the dash that have nothing to do with an actual problem. Behind the lens sits a highly reflective amber reflector, which isn't just cosmetic — it's there to meet DOT and SAE compliance standards and to give the housing that OEM-style appearance rather than looking like a bargain-bin swap. If you want more background on how reflector and lens design affects headlamp performance generally, Wikipedia's article on automotive headlamps is a decent technical primer, unrelated to us, that explains the basics.

Installation

This is a direct bolt-on replacement for the original equipment headlight — no wiring changes, no modifications to the mounting points. That said, we don't include a printed installation instruction sheet in the box, and we'd rather be upfront about that than have you searching the packaging for something that isn't there. Most owner-operators and shop techs who've done a T680 headlight before can handle this without much trouble, but if this isn't a job you do often, we'd recommend having a professional install it, particularly given how much you're relying on your lighting to be right on a commercial vehicle. Get it seated correctly the first time and you shouldn't have to touch it again for years.

Specifications

• Part Number: P54-6164-100
• Fitment: 2013-2021 Kenworth T680, factory halogen headlight models only (NOT compatible with LED DRL models)
• Side: Left / Driver side
• Housing: Chrome
• Lens: Clear, injection-molded polycarbonate, UV-protected
• Condition: 100% brand new
• Reflector: Amber, DOT and SAE compliant
• Electrical: Built-in load resistors (prevents hyperflashing/bulb-out codes)
• Package Contents: 1 headlight assembly (driver side only — passenger side sold separately)
• Installation: Direct bolt-on; installation instructions not included; professional installation recommended

Why This Is the Right Kenworth T680 Headlight for the Job

We hear from a lot of owner-operators and fleet buyers who just want the truck back on the road looking right and lighting the way it's supposed to, without a bunch of surprises during install. That's really the whole idea behind this part: match the factory halogen fitment exactly, keep the chrome-and-clear-lens look consistent with the rest of the front end, and build in the electrical protection so you're not chasing dash warning lights after a routine headlight swap. It's not trying to be anything fancier than a solid, correctly-fitted replacement for a truck that needs one.

This headlight is currently listed in our Lighting collection, as well as our broader Truck & Commercial Parts and Body & Exterior collections, so if you're outfitting a T680 with more than just a headlight, it's worth browsing those while you're here. If you're not sure whether this part matches what's currently on your truck, our FAQ page covers a lot of the common fitment and ordering questions, and you're always welcome to reach out directly through our contact page if you want a second set of eyes before you commit.

For anything related to how the part ships or when to expect it, check our shipping information page, and once your order's on the way, the track your order page will keep you posted. And if it turns out something's not right after it arrives, our warranty page spells out how we handle that. We built this listing to be as straightforward as the part itself: driver side, halogen, direct fit, no guesswork — order the one that matches your truck and you'll be back to a properly lit front end without any drama.