Frequently Asked Questions About Kenworth T660 Cab Lights

What year models of Kenworth T660 are these cab lights compatible with?

Our Kenworth T660 cab lights are designed to fit model years 2008-2016. The mounting holes and electrical connections match the factory specifications for these years. However, we recommend verifying your specific truck's configuration before ordering, as some custom sleeper configurations may have different mounting patterns. Contact our support team with your VIN if you need help confirming compatibility.

How difficult is the installation process, and what tools do I need?

Installation typically takes 2-3 hours for someone with basic mechanical skills. You'll need a drill with 3/8" and 1/2" bits, wire strippers, electrical tape or heat shrink tubing, and basic hand tools. Most installations involve drilling new holes in the cab roof if upgrading from factory lights to aftermarket options. We include detailed instructions with diagrams, and many customers successfully complete the installation in their driveway. Professional installation usually costs $150-300 if you prefer that route.

What's the difference between LED and incandescent cab lights for my T660?

LED cab lights draw 80% less power, last 50,000+ hours compared to 2,000 hours for incandescent, and provide brighter, more consistent illumination. They also generate less heat, reducing lens discoloration and housing damage. While LED options cost more upfront ($150-300 per set vs. $50-100 for incandescent), most drivers see the investment returned through reduced replacement costs and lower electrical system strain. LEDs are also DOT compliant and available in amber or clear lens options.

Are these cab lights waterproof, and how do they hold up in extreme weather?

Quality cab lights for the T660 feature IP67 or IP68 waterproof ratings, meaning they're fully sealed against dust and can withstand direct water pressure. Look for lights with silicone gaskets and stainless steel hardware to prevent corrosion. Our lights are tested in temperatures from -40?F to 185?F. The polycarbonate lenses resist cracking in cold weather and UV damage in sunny climates. Many drivers report 5+ years of service without water intrusion when properly installed with the included gaskets and sealant.

Do these cab lights come with the wiring harness, or do I need to purchase it separately?

Most complete cab light kits include a plug-and-play wiring harness that connects to your T660's existing cab light circuit. The harness typically features weatherproof connectors and is pre-wired for 5 lights with 18-gauge wire rated for 12/24V systems. If you're replacing just the lights and your existing wiring is in good condition, you can purchase lights-only sets. However, we recommend replacing old wiring to prevent electrical issues, especially if your current harness shows signs of corrosion or heat damage.