Kenworth T680 Lights

Frequently Asked Questions About Kenworth T680 Lights

Will these lights fit my specific year model T680, and are there any compatibility issues I should know about?

Most aftermarket lights for the Kenworth T680 are designed to fit model years 2013 through current production models. However, there are notable differences between pre-2018 and post-2018 T680s due to the facelift update. Pre-2018 models have different headlight bucket dimensions and mounting points compared to newer models. Always verify the specific year range listed for each product, and be aware that some LED headlights may require additional wiring adapters for trucks without factory LED options. Day cab and sleeper models typically share the same lighting specifications.

What's involved in installing LED headlights or auxiliary lights on my T680, and will I need special tools?

Installing replacement headlights typically takes 30-45 minutes per side and requires basic hand tools including screwdrivers, socket wrenches, and trim removal tools. The main challenges include accessing the mounting bolts behind the bumper (which may require partial bumper removal) and properly connecting any required CAN-bus adapters to prevent error messages. For auxiliary lights like fog lamps or work lights, you'll need to run new wiring, install switches, and possibly drill mounting holes. Many drivers report that having a second person helps significantly when aligning the lights during installation.

Are LED lights really worth the extra cost compared to standard halogen bulbs for my T680?

LED lights typically last 30,000-50,000 hours compared to 1,000-2,000 hours for halogen bulbs, making them cost-effective for high-mileage operations. They draw significantly less power (reducing alternator load), produce a cleaner white light that reduces eye strain during night driving, and generate less heat which helps preserve the headlight housing. The main consideration is ensuring compatibility with your truck's electrical system - some older T680s may show bulb-out warnings without proper resistors or CAN-bus adapters.

What's the difference between DOT-approved and SAE-compliant lights, and which do I need?

DOT approval is legally required for all lights used on public roads in the United States, while SAE compliance indicates the light meets industry engineering standards. For your T680, all forward-facing white lights (headlights, fog lights) and rear-facing red lights (tail lights, brake lights) must be DOT-approved. Many states also require amber marker lights to be DOT-approved. Off-road or work lights mounted on the back or sides don't require DOT certification but should still meet your company's safety standards. Look for lights that are both DOT and SAE marked for the best quality and legal compliance.

How do I prevent moisture buildup and fogging in my T680's headlight assemblies?

Moisture issues are commonly caused by damaged seals, improper installation, or low-quality aftermarket lights. When installing new lights, ensure all rubber gaskets are properly seated and use dielectric grease on electrical connections. For existing lights with minor fogging, drilling a small ventilation hole (1/8 inch) at the bottom of the housing can help, though this voids most warranties. Quality aftermarket lights should include breather vents and sealed construction. If moisture persists, check for cracks in the lens or housing - these typically require complete replacement rather than repair.