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Underground Lighting  |  SKU: 4257-F150WA

2019 Ford F-150 / F-250 / F-350 LED DRL Front Turn Signal Replacement Bulbs for 3X Visibility| 4257 Amber, Built-in Resistor, No Hyperflash | 300% Brighter 1200LM output (PAIR)

$64.99 $69.99

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Poor visibility in rain or fog?

  •  300% brighter than halogen for clearer signalling
  • Built-in resistor fixes hyperflash instantly
  • Engineered to last 10× longer
  • 4257 plug & play, zero wiring required
  • Designed & assembled in the USA, parts made in Japan

Why this Front Turn Signal Bulb for Ford beats everything else

  • - Rain, fog, and glare reduce signal clarity. Halogen bulbs have limited brightness, lowering detection distance. LED systems enhance contrast and visibility, enabling other drivers to react more quickly in poor weather conditions.

  • - Higher luminous intensity increases signal detection range and clarity. Combined with a 360° beam distribution, it ensures visibility from side and rear angles, critical for lane changes, merging, and intersection turns.

  • - LED bulbs draw lower current than halogen, triggering rapid flashing. Integrated resistors replicate factory load, restoring correct blink frequency without external wiring, ensuring consistent and compliant signal operation.

  • - Excess heat degrades LED chips, reducing brightness and lifespan. Active cooling with fan and heatsink regulates temperature, maintaining stable output and preventing premature failure under continuous operation, increasing lifespan 12X

  • - 4257 direct-fit, non-polar design ensures compatibility with 12V systems. No rewiring or modifications required. Installation takes 10 minutes, reducing errors and ensuring immediate performance without additional components.

  • - Designed and assembled in the USA with Japanese components, ensuring precision and durability. Higher manufacturing standards improve thermal stability, electrical consistency, and overall lifespan compared to low-cost generic LED alternatives.

  • Read Underground Lighting Turn signal light for Ford 150 and make an informed decision! Don't forget to explore our LED switchback turn signals & turn signal bulbs 



 

Installation time is approximately 10 minutes. There is no need for slicing or complicated wiring. This light is a plug-n-play installation and operation. 

    WHAT'S INCLUDED

    BULBS :
    2X LEDs Bulbs With Built in Resistors
    WARRANTY :
    This product has a Includes a 1-Year Manufacturer Warranty covering defects under normal use.

    PRODUCT INFORMATION

    Function - Front Turn Signal / DRL

    Variants - 4257 / 7443

    LED Chips - 54 SMD LEDs

    Beam Angle - 360° Coverage

    Color - Amber / Amber - White

    Electrical Design - CANBUS, Non-polar, CK compatible, Plug & Play 

    TECH SPECS

    WATTAGE :
    24W
    LENGTH :
    2.4"
    DIAMETER :
    .83"
    INTENSITY :
    1200 Lumens
    BLINKER CIRCUITS :
    No Resistors Required
    CIRCUITS :
    12V
    This product has a This product has a Includes a 1-Year Manufacturer Warranty covering defects under normal use.

    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. 

    Yes—designed for dual-function circuits (Turn Signal + DRL).
    4257 bulbs support dual-intensity output, matching factory DRL low-power mode and full-bright turn signal mode without conflict.

    No—completely independent systems. Turn signals/DRLs operate on separate circuits from headlight sensors and rain modules, so there’s zero interaction or interference.

    Covers manufacturing defects under normal use:

    • LED chip failure
    • Cooling system malfunction (fan/heatsink)
    • Electrical faults (resistor/CANBUS issues)

    Does not cover physical damage, incorrect installation, corrosion, or water ingress from broken housings.

    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

    No—built-in resistor handles load simulation.

    • Prevents hyperflash
    • Maintains correct flash rate (60–120 flashes/min standard)
    • Works with factory BCM without coding

    FORScan not required in normal conditions.

    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

    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.

    COMPATIBILITY

    FITMENTS :
    2019 Ford F-150 , 2019 Ford F-250 Super Duty , 2019 Ford F-350 Super Duty

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