How many bulbs are included?

This product includes one bulb. If you want to replace both bulbs at the same time, make sure to order two.

Is any special wiring required?

No, this bulb is designed to be plug-and-play. Simply remove your factory bulb and plug this one in. It is non-polar and CK compatible, so it should work in most applications.

Will this bulb last long?

This bulb is built with constant-current circuitry and transient suppression. This means it is protected from voltage spikes and should last for years.

Diode Dynamics 4257 HP24 LED Bulb - Cool - White Switchback (Single)

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Diode Dynamics

Diode Dynamics 4257 HP24 LED Bulb - Cool - White Switchback (Single)

Name: Diode Dynamics 4257 HP24 LED Bulb - Cool - White Switchback (Single)
Brand: Diode Dynamics
Price: 40.91 USD
Availability: InStock

$40.91

Adds a cool white running light and amber turn signal to your vehicle. Direct replacement for 4257 bulbs.

Key Features

True replacement — Replaces factory incandescent 4257-size front turn signal bulb.
Custom-molded base connector — Fits right.
Dual-color function — Adds cool white running light along with amber turn signal.
Samsung LEDs — Arranged around the bulb for maximum brightness.
No yellow appearance — When switched off, the bulb appears clear.
Non-polar and CK compatible — Easy to install.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

Fits these vehicles

Ford F-150 2015-2018
Ford F-250 Super Duty 2008-2017

Need Help?

631-982-0042

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Since 1957

Family-owned

Product Details

Add dual-color functionality and a modern appearance to your front turn signals with the 4257 HP24 turn signal bulb. This bulb lights up white when your headlights are turned on and flashes amber when the turn signals are activated.