Nilight Trailer Light Box Kit — Steel 6" Oval Taillight + Round Marker & License LED, Powder-Coated

Nilight Steel Trailer Light Boxes Kit is a welded-or-bolted rear lighting enclosure that houses an oval taillight, round side marker and license plate lamp — providing stop/turn/tail and marker illumination in one rugged assembly.

This complete light box kit is built for trailers that need a durable, weather-resistant lighting solution. The assembly pairs a heavy-duty powder-coated steel enclosure with bright SMD LED lamps designed for stop/turn/tail, amber turn signal, and marker duties. It ships with pre-cut mounting holes and pigtail wiring so you can bolt or weld the box to the rear, side, top or bottom frame and hardwire the lights directly into your trailer harness.

How does the kit simplify trailer lighting upgrades?

The Nilight kit consolidates several lamps into a single steel housing to reduce installation steps and improve durability. Because lights arrive mounted in the box and holes are pre-cut, installers avoid repetitive drilling and alignment tasks. Wiring is color-coded to match standard trailer functions so integration with existing harnesses is straightforward.

• Pre-cut openings for 6" oval taillight, 2" round side marker and license plate light
• Lights pre-installed in the enclosure to cut on-site assembly time
• Color-coded pigtails for quick hardwire connection to trailer wiring
• Designed for bolt-on or weld-on mounting to multiple frame locations

What kind of brightness and light functions should I expect?

This kit uses SMD LEDs to deliver high visibility for brake and turn signals and lower-intensity illumination for tail and marker functions. The oval lamp supports two brightness levels (high for stop/turn, low for running/tail), while the round marker and the 3-LED license lamp add side and plate visibility. LEDs mean quicker illumination and longer life than incandescent bulbs.

• High-brightness red output for stop and turn signaling
• Lower-brightness red for tail/running light mode
• Amber output for turn indication via the oval lamp
• Dedicated 3-LED license plate light for plate illumination

How durable is the steel box and how does it hold up in bad weather?

The enclosure is formed from heavy-gauge steel and finished with a black powder coat to resist corrosion and road wear. Rubber or silicone seals around the lamps protect the LEDs and wiring from moisture and debris. The pre-cut fit and secure mounting options reduce vibration and help maintain a long-lasting connection in demanding towing conditions.

• Heavy-duty steel construction for impact resistance
• Black powder-coated finish to inhibit rust and chipping
• Sealed lamp openings and silicone gaskets for weather protection
• Works reliably in rain, road spray and variable temperatures

What should I know about installation and removal?

Installation is practical for DIYers or pros: hardwire each pigtail to the matching trailer wire, then bolt or weld the box to the frame. The product includes straightforward wiring conventions: white is ground for markers/plate lights, while oval lamp wires are separated by function. Removing the oval lamp and silicone is done manually when replacement or access is required.

• Hardwire pigtails to existing trailer wiring (color-coded)
• Weld-on or bolt-on mounting options for flexibility
• Oval lamp removed by pressing down until it falls out for service
• Instructions for pushing out round marker from inside the box included

Who is this for: The Nilight Steel Trailer Light Boxes Kit is suited to trailer owners, fabricators and fleet operators who want a compact, durable rear lighting solution. It’s a practical choice for utility trailers, equipment trailers, box trailers and anyone upgrading to LED lighting for higher visibility and lower maintenance. If you need a weatherproof, pre-assembled lighting enclosure that bolts or welds easily to your trailer frame, this kit was made with that use in mind.