Freightliner FLC120 Lights

Frequently Asked Questions About Freightliner FLC120 Lights

Will these lights fit my specific year FLC120 model?

Most aftermarket lights for the FLC120 are designed to fit models from 1990 through 2003, which covers the entire production run. However, there are slight variations between pre-1996 and post-1996 models, particularly in the headlight bucket design. Always verify the specific year range listed for each product, and when in doubt, contact us with your OEM number for exact fitment confirmation.

What's the difference between halogen and LED options for my FLC120?

LED lights offer 3-5 times longer lifespan (typically 50,000+ hours vs 1,000-2,000 for halogen), draw less power from your electrical system, and provide brighter, whiter light output. However, LEDs cost more upfront and may require load resistors or flasher relay upgrades for turn signals. Halogen lights are less expensive initially and work with stock electrical systems but require more frequent replacement and produce more heat.

Do I need any special wiring or adapters to install these lights?

Most direct replacement lights use the same H4 connector system as factory lights, making them plug-and-play. However, when upgrading to LED lights, you may need to install load resistors for turn signals to prevent hyper-flashing, or upgrade your flasher relay to an LED-compatible unit. Some LED headlights also require polarity-specific connections, so double-check your wiring before installation.

Are DOT-approved lights really necessary for my truck?

Yes, DOT approval is legally required for all lights used on public roads. Non-DOT lights can result in failed inspections, citations, and potential liability issues in accidents. All our FLC120 lights marked as DOT-approved meet FMVSS 108 standards for beam pattern, brightness, and construction quality. Look for the DOT marking stamped on the lens or housing.

What's involved in replacing sealed beam headlights with LED units?

Replacing sealed beams with LED units is typically straightforward - remove the headlight retaining ring, disconnect the old sealed beam, connect the new LED unit to the existing H4 plug, and reinstall the retaining ring. The entire process usually takes 15-30 minutes per light. Some LED units have slightly different depth dimensions, so you may need to adjust the headlight aim afterward using the adjustment screws on the bucket assembly.