Side Marker Light Assembly

Side marker lights are small but essential pieces of exterior lighting. Mounted near the corners of a vehicle, they glow whenever the parking lights or headlights are on, showing other drivers where your vehicle is and how long it is when seen from the side. A side marker light assembly typically includes the housing, lens, bulb or LED module, and the gasket or mounting hardware needed to install it.

Why Side Marker Lights Matter

In the United States, side marker lamps are required equipment under Federal Motor Vehicle Safety Standard 108. All vehicles must be equipped with side marker lamps, an amber lamp positioned as far forward and a red lamp as far to the rear as practicable. Trailers need two amber side marker lamps toward the front and two red ones toward the rear, and trailers 30 feet or longer also need amber intermediate side marker lamps at or near the midpoint. A cracked lens, a water-filled housing, or a dead bulb can mean a failed inspection, and more importantly, a vehicle that is harder to see on dark roads, in rain, or at intersections.

What to Consider When Shopping

• Color and position: Amber goes toward the front and red toward the rear. Make sure the lens color matches the location you are replacing.
• Fit and mounting style: Factory-style assemblies are made for a specific year, make and model. Universal marker lamps, common on trucks and trailers, mount with screws, grommets or through-holes.
• Sealing and durability: Good gaskets and UV-resistant lenses keep moisture out and extend service life.
• Bulb or LED: LED markers draw less current and typically last longer than incandescent bulbs, which is useful on trailers and work trucks that see vibration and long hours of use.
• Compliance: Look for DOT-compliant lamps, especially on commercial vehicles and trailers, where roadside inspectors check for correct color, secure mounting and working illumination.

Top Brands in Side Marker Light Assemblies

Grote is a well-known name in commercial vehicle and trailer lighting. Its marker and clearance lamps are a common choice for fleets, trailers and heavy-duty equipment where durability matters.

Recon focuses on truck lighting and styling. Its marker lighting suits owners who want a custom look on a pickup while keeping the lamp's required visibility function.

Anzo USA is known for aftermarket truck and SUV lighting, including tail lights and headlights, so its marker lamps are a natural fit for owners coordinating upgraded lighting across a vehicle.

Dorman is a major supplier of replacement parts for vehicles that are no longer new. Its side marker assemblies are aimed at straightforward repairs where a direct-fit replacement is needed.

Genuine Porsche parts are the original-equipment choice for Porsche owners who want exact factory fit, finish and lens appearance, which matters for restoration and preserving originality.

Keeping Your Marker Lights in Good Shape

Check your marker lights during routine maintenance, along with headlights and tail lights. Look for fogged lenses, corroded sockets, loose wiring and cracked housings. Replacing the whole assembly instead of just the bulb is often the best fix when moisture has gotten in or the lens has yellowed or cracked, because a fresh gasket and lens restore both the seal and the brightness.