Freightliner FLC112 Lights

Frequently Asked Questions About Freightliner FLC112 Lights

Will these lights fit my specific year model FLC112?

Most aftermarket lights for the Freightliner FLC112 are designed to fit models from 1984 through 2003. However, there are some variations between early models (1984-1993) and later models (1994-2003), particularly in headlight bucket sizes and turn signal mounting points. Always verify the specific year range listed for each product, and when in doubt, measure your existing light housing dimensions before ordering. Pay special attention to 7-inch round versus 5x7-inch rectangular headlight configurations.

Do I need any special wiring or adapters to install LED lights on my FLC112?

When upgrading from halogen to LED lights, you may need additional components depending on your truck's electrical system. Most LED headlights require H4 to H13 adapters for proper fitment. For turn signals and marker lights, you'll likely need load resistors or an electronic flasher relay to prevent hyper-flashing. Some LED headlights are plug-and-play with built-in CANbus compatibility, while others may require a separate decoder. Check if the lights you're considering include these components or if they need to be purchased separately.

How difficult is it to replace the headlights on an FLC112?

Headlight replacement on the FLC112 is generally straightforward and can be completed in 30-45 minutes per side with basic hand tools. You'll need to remove the headlight bezel (usually 4-6 screws), disconnect the wiring harness, remove the retaining ring, and swap the bulb or sealed beam unit. The main challenge is accessing the back of the housing in tight engine compartments. Having a magnetic screwdriver and working from the wheel well can make the job easier. Always disconnect the battery before starting electrical work.

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

DOT (Department of Transportation) approval is required for all lights used on public roads in the United States. SAE (Society of Automotive Engineers) certification indicates the light meets specific performance standards but isn't legally required. For your FLC112, all forward-facing lights (headlights, turn signals, clearance markers) must be DOT approved to pass inspection and remain street legal. Many quality aftermarket lights carry both certifications. Avoid lights marked "for off-road use only" if you drive on public roads.

Why are my new LED lights flickering or not working properly?

LED flickering or failure on the FLC112 typically stems from three issues: incompatible voltage (LEDs require stable 12V-14V), lack of proper grounding, or missing load resistors. First, check all ground connections and clean any corrosion. If turn signals flash too fast, install 6-ohm 50W load resistors on each LED bulb circuit. For headlight flickering, ensure you're using LEDs designed for 12V systems with built-in voltage regulators. Some FLC112s with daytime running lights may require a DRL decoder to prevent flickering at low voltage.