Partswcgg LED Trailer Light Kit 12V with 25ft Wiring Harness — Submersible, Complete Tail & Marker Kit

Partswcgg's 12V LED Utility Trailer Tail Light Wire Kit is a complete, submersible lighting solution that includes tail lights, marker lights, multiple LED light bars, a 25-ft wiring harness and mounting hardware for immediate trailer upgrade.

This all-in-one kit supplies the essentials to replace or upgrade lighting on utility, boat, equipment or cargo trailers. Components are fully sealed for submersion, use polycarbonate lenses and stainless steel bases where noted, and the included 25-foot harness with a 4-flat plug gives ample reach to most tow vehicles. The set covers running lights, stop/turn/brake functions, clearance and side markers, a third brake bar, license plate illumination and mounting accessories so you can finish installation in a single job.

What items are included in the kit and why does that matter?

The kit bundles multiple lamp types so you won’t need separate purchases. Having matched LEDs and hardware simplifies wiring, ensures consistent brightness, and keeps the trailer compliant with common lighting requirements.

• 2 square rear combination tail lights (stop/turn/tail)
• 6 mini oval side fender marker lights (2 red, 4 amber)
• 2 × 15" trailer 3rd brake tail light bars for left and right signaling
• 1 × 14.17" 3-light red clearance/ID marker bar
• 25-foot wiring harness with 4-flat plug, license plate bracket, mounting hardware

How reliable and weatherproof are these LED lights?

All lamps in the kit are submersible and fully sealed, preventing water ingress that damages circuitry. Lenses are polycarbonate and key mounting parts use stainless steel for corrosion resistance on boat trailers and in wet conditions.

• Fully sealed housings protect internal LEDs and wiring
• Polycarbonate lenses resist impacts and UV fading
• Stainless steel base on the ID marker bar reduces rust
• Designed for surface mounting and marine exposure

How do I wire the lights correctly for stop, tail and running functions?

The kit uses color-coded leads to separate functions; follow the wiring scheme to ensure lights operate as intended. Ground wires and brightness-specific leads control whether LEDs act as running lights or full-bright brake/turn signals.

• Square tail lights: white = ground, yellow = brake/high brightness, brown = running/low brightness
• 15" LED tail light bars: white = ground, red = brake/stop/turn high brightness, black = running/low brightness
• Mini side marker lights: white = ground, black = positive
• 25-ft harness with 4-flat plug connects to vehicle towing socket

Will this kit fit wider trailers and where do the ID lights mount?

The 14.17" ID marker bar is intended for trailers wider than 80 inches and mounts on the trailer surface. It contains three red LEDs per marker cluster (nine total) and uses the mounting hardware as the ground path for a clean installation.

• 14-1/3" long ID bar with three 3-LED markers (total 9 LEDs)
• Surface-mount design for easy placement on rear header or frame
• Single lead wire for power; grounds through mounting screws
• Red lens and red LEDs for visibility and regulation compliance

Who this kit is for: DIYers, fleet owners, boaters and contractors who need a comprehensive, waterproof trailer lighting upgrade in one purchase. If you want consistent LED brightness, corrosion-resistant parts for wet environments, and a long harness to reach the tow vehicle, this kit offers a plug-and-play bundle with detailed wiring guidance to finish the job quickly.