Partswcgg 12V Trailer LED Tail Light Kit — Submersible 25ft Wiring Harness, Complete Brake/Marker Set

Partswcgg 12V Trailer LED Lights Tail Kit is a complete submersible lighting set that upgrades rear, side and third-brake illumination with a 25-foot harness and all mounting hardware included.

This kit bundles the main exterior trailer lighting you need in one package: two square rear combination tail lights with integrated license illumination, a 15.5" third brake identification light bar, six mini oval side marker lamps, a long 25-foot wiring harness with 4-flat plug, license plate bracket, and mounting hardware. Every lamp is fully sealed for submersion, making the set suitable for boat trailers and road trailers alike. The components support stop, turn, tail, running, marker, reflector and license plate lighting functions so you can meet common trailer lighting needs in a single upgrade.

How does the kit simplify trailer lighting upgrades?

The kit groups all primary trailer lights and necessary wiring into one package so you avoid sourcing individual parts. The included 25-foot harness reaches most trailer lengths and the 4-flat connector plugs into standard towing sockets, reducing installation time.

• Complete set: 2 square tail lights, 15.5" third brake bar, 6 mini oval markers, harness, bracket, hardware
• 25 ft wiring harness with 4-flat plug fits typical tow vehicles
• All mounting hardware included for immediate installation

Are these lights waterproof and reliable for boat trailers?

Yes — each lamp is fully sealed and designed to resist water intrusion so circuits are protected during submersion or splash exposure. The robust housings and sealed LEDs reduce corrosion risk and preserve light output in wet environments.

• Fully sealed, submersible lamp bodies prevent water entry
• Durable LED diodes maintain brightness with low power draw
• Stainless or corrosion-resistant hardware for marine use

What lighting functions and brightness should I expect?

The square tail lights and 15.5" light bar provide multi-function output: tail/running, brake/stop, and turn signals. The square units use 15 diodes with an integrated white license lamp; the third-brake bar uses 11 high-visibility LEDs; mini markers provide side clearance and reflex visibility.

• Square tail lights: 15 LEDs each, built-in license illumination (3 white LEDs)
• 15.5" brake light bar: 11 LEDs for stop, turn and tail functions
• Mini oval markers: 2 LEDs each for side clearance and reflex reflection

How is the wiring organized and what are the connections?

Wiring colors follow common trailer conventions but vary by component: the square lights use a separate license lamp feed; the light bar and mini markers follow high/low brightness and ground wiring designed for simple splicing to the harness. Follow the color guide when connecting to avoid reversed signals.

• Square tail lights: white = ground, yellow = brake high brightness, brown = running light/left license
• 15.5" bar: white = ground, red = brake/turn (high), black = running (low)
• Mini markers: white = ground, black = positive lead

Who this kit is for: Boat owners, trailer builders and anyone wanting a single-package lighting upgrade will find this Partswcgg kit practical. It’s tailored to users who need submersible, multi-function trailer lighting with a long harness and included hardware—ideal for boat trailers, utility trailers and general-purpose towing where waterproofing and easy installation matter.