HERCOO Side Mirror Marker Light for Silverado & Sierra (Smoke Lens, 2016–2019) — Sequential Switchback, Plug-and-Play

HERCOO sequential switchback side mirror marker lights are direct-fit LED assemblies that replace factory mirror turn signals on select Chevy Silverado and GMC Sierra models, providing bright white running light and dynamic amber sequential turn signaling with a smoked lens.

Upgrade the exterior lighting of your Chevrolet or GMC truck with a modern, highly visible mirror marker that combines crisp white illumination for daytime running with a flowing amber sequence for turn indication. These plug-and-play assemblies are built from durable polycarbonate with sealed construction and rows of high-output SMD LEDs to increase visibility and refresh the truck's look without cutting or splicing wiring.

Will these mirror markers fit my Silverado or Sierra?

HERCOO side mirror markers are engineered to be direct replacements for specific model years and original part numbers, so fitment is straightforward when your truck matches the listed years. They replace factory part numbers 23444105 and 23444106 and are made to snap into the existing mirror housing without modification.

• Compatible with Chevrolet Silverado 1500 (2016–2018)
• Compatible with Silverado 2500 HD / 3500 HD (2016–2019)
• Compatible with GMC Sierra 1500 / 3500 HD (2016–2018) and Sierra 2500 HD (2016–2019)
• Plug-and-play fit; no cutting or splicing required

How does the sequential switchback function work and what does it look like?

The lamp uses four rows of 3528 SMD LEDs that operate as a white running/marker light and change to an amber, flowing sequence when the turn signal is activated. The sequential amber provides a clear directional indication to other road users while the switchback white improves daytime visibility and aesthetic appeal.

• White switchback for marker/running light use
• Dynamic amber sequential turn pattern for clear signaling
• 4-row LED array for bright, even illumination

How durable and weather-resistant are these lights?

HERCOO builds these assemblies from scratch-resistant polycarbonate and seals the electronics to resist road moisture and normal exposure. The lens finish is smoked for a discreet OEM-inspired look while remaining transparent enough for strong LED output.

• PC material lens: anti-scratch and UV-resistant
• Waterproof construction to withstand rain and road spray
• Long-life SMD LEDs designed for extended service

What does installation involve and what’s included in the package?

Installation is designed to be simple: remove your factory mirror marker, rotate the connector if needed (there is a positive and negative), and plug the HERCOO assembly in place. The kit includes two sequential switchback mirror marker lights; follow polarity if the unit does not illuminate immediately.

• Includes two sequential switchback side mirror marker lights
• Direct replacement for factory assemblies (no modification)
• If the lamp does not light, rotate the connector 180° to correct polarity

Who is this for? These HERCOO mirror marker lights are ideal for Chevy and GMC truck owners who want a brighter, more modern signaling and marker solution without complex installation. They suit drivers seeking improved visibility and a refreshed exterior appearance for model years listed above, plus anyone replacing damaged or faded factory mirror indicators.