2019–2021 Ford F-150 / F-250 / F-350 LED Front Turn Signal Replacement Bulbs for 3X Visibility | 4257 Amber, Built-in Resistor, No Hyperflash | 300% Brighter 1600LM (PAIR)

In North America, amber turn signals are the legal standard for all vehicles. Other drivers recognise amber signals more quickly, and reaction time is reduced by up to 0.3 seconds. Our LEDs automatically handle this requirement, displaying the correct color at the right time. When you're finding a new bulb, you won't need to choose between white or amber LED switchback turn signal lights - the dual-function technology does this for you. 

Equivalent base size and seating depth, designed to match OEM tolerances. LED housing is compact, ensuring proper locking and alignment without looseness or fitment issues.

Did you start the engine before testing? The vehicle engine must be on and running for the BCM to turn on for the load resistors to be detected. Read the Hyperflash guide & know the details

Check one of these:

• Owner’s manual (bulb size section)
• Remove existing bulb → 4257 = dual contact pins (offset), 7443 = wedge base
• Match with OEM spec for front turn signal/DRL circuit

 2019 is a split year—both types exist depending on trim

Yes. Built to exact 4257 OEM specifications, ensuring proper fitment within factory tail light assemblies without clearance or alignment issues.

No LEDs run cooler than OEM bulbs and will not harm or cause any damage to your wiring harness or housings. And our LEDs have an advanced cooling system, making it efficient and durable with a lifespan of 25k+ hours

No, the LED does get hot, but not as hot as an incandescent bulb.

Yes, ours is unique and different from other competitors.
Unlike other brands out there that don't work, ours will. We specially designed the circuit board to work with the BCM.