Kenworth T660 Lights

Frequently Asked Questions About Kenworth T660 Lights

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

Most aftermarket lights for the Kenworth T660 are designed to fit model years 2008-2016. However, compatibility can vary depending on the specific light type. Headlights and fog lights typically have universal fitment across all T660 model years, while marker lights and turn signals may have slight variations between pre-2011 and post-2011 models due to minor bumper design changes. Always verify your truck's specific year and OEM with our customer service team if you're unsure about fitment.

Are LED lights a direct plug-and-play replacement for my factory halogen lights?

Most LED headlights and fog lights for the T660 require additional components for proper installation. While the physical mounting is typically the same as factory lights, LED conversions often need load resistors or decoders to prevent hyperflashing and dashboard error messages. Some high-quality LED units come with built-in CANbus systems that eliminate these issues. For marker lights and interior lights, most LED replacements are true plug-and-play. We recommend checking the product description for specific installation requirements or purchasing a complete LED conversion kit that includes all necessary adapters.

What's the difference between DOT approved and non-DOT approved lights?

DOT approved lights meet Department of Transportation standards for on-road use and are legally required for street-driven trucks. These lights have been tested for proper beam patterns, brightness levels, and durability. Non-DOT lights are typically brighter or have custom designs but are only legal for off-road or show use. For headlights and fog lights, we strongly recommend DOT-approved options to avoid tickets and ensure safe nighttime visibility. Many drivers use non-DOT LED marker lights without issues, but this is at your own discretion.

How difficult is it to install aftermarket lights on my T660, and what tools do I need?

Installation difficulty varies by light type. Headlight replacements typically take 30-45 minutes per side and require basic hand tools like screwdrivers and socket wrenches. You'll need to remove the grille and possibly the bumper end caps for access. Fog lights usually require drilling if your T660 didn't come with them factory-installed, adding complexity. Marker lights are the easiest, often taking just 5-10 minutes each with simple clip or screw mounting. Most installations can be done in a home garage, though fog light additions may benefit from professional installation if you're not comfortable with drilling and wiring.

Will aftermarket HID or LED lights cause electrical problems with my truck?

Quality HID and LED lights designed specifically for the T660 rarely cause electrical issues when properly installed. However, cheap universal kits can trigger problems like flickering, radio interference, or blown fuses. The T660's electrical system can be sensitive to the lower power draw of LEDs, which may cause hyperflashing or "bulb out" warnings. This is easily solved with load resistors or choosing lights with built-in resistors. HID systems pull more initial power during startup, so ensure your alternator and battery are in good condition. Always use the recommended gauge wiring and include proper fuses in any aftermarket light installation.