What is the advantage of using LED turn signal bulbs?

LED turn signal bulbs offer a modern appearance with an instant on-off, unlike the slow glow of factory incandescent bulbs. This instant activation adds a distinct look to your vehicle.

What if I experience hyperblinking after installing these LED bulbs?

If you experience hyperblinking, you'll need to add resistors (sold separately). A 6-ohm resistor uses about the same power as a standard turn signal bulb. One resistor is needed to replace each turn signal bulb.

Will the white running light be visible with an amber lens?

To properly see the white running light, you must have clear reflectors/lenses over the turn signal bulb. The amber lens will tint the white light.

Diode Dynamics 3157 LED Bulb HP24 Dual-Color LED - Cool - White Set of 4

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Diode Dynamics

Diode Dynamics 3157 LED Bulb HP24 Dual-Color LED - Cool - White Set of 4

Name: Diode Dynamics 3157 LED Bulb HP24 Dual-Color LED - Cool - White Set of 4
Brand: Diode Dynamics
Price: 163.79 USD
Availability: InStock

$163.79

LED turn signal bulbs with instant on-off and switchback function. A simple way to modernize your truck's lighting.

Key Features

Modern LED appearance — instant on and off
Compatible with GMC Sierra 2500/3500 — direct replacement for front turn signal bulbs
Direct fit — no modification with factory 3157 bulb size
Multiple brightness levels — designed to match the factory brightness ratio
Switchback function — illuminates in white for running/parking light, then switches to amber when turn signals are activated

⚠️ 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