Product Overview
The Nilight TR-155 LED Trailer Light Kit provides comprehensive lighting solutions for various 12V DC vehicles, including trailers, boats, trucks, RVs, and more. This kit includes all necessary components for stop, turn, tail, side marker, and license plate lighting, ensuring compliance and safety on the road.

Package Contents
Verify that all components listed below are included in your package:
- 2 x Square LED Trailer Lights
- 1 x 16-inch Red LED Brake Light Bar
- 2 x Red Side Marker Lights
- 4 x Amber Side Marker Lights
- 1 x 25ft Trailer Wiring Harness
- 1 x License Plate Bracket
- 4 x Reflectors
- 1 x Hardware Pack (includes wire nuts, wire clips, self-tapping screws, ring connectors, splice connectors, screws)


Installation Instructions
Component Dimensions
Refer to the following diagrams for component dimensions to ensure proper fitment:


Mounting
The square lights are designed for stud mounting. Ensure a firm and durable installation by tightening the mounting nuts securely. The side marker lights and the 16-inch brake light bar are installed using screws.
Wiring Connections
Proper wiring is crucial for the correct function of the trailer lights. Refer to the diagram and instructions below. If an existing trailer harness is present, connect color-to-color. For new installations, use the provided two-wire bundle.
- Square Lights:
- White wire: Ground (Negative)
- Brown wire: Running Light (Positive)
- Yellow wire: Left Turn and Brake Light (Positive)
- Green wire: Right Turn and Brake Light (Positive)
- 16-Inch Brake Light Bar:
- White wire: Ground (Negative)
- Black wire: Low Brightness Tail Light (Positive)
- Red wire: High Brightness Brake Light (Positive)
- Side Marker Lights:
- White wire: Ground (Negative)
- Black wire: Positive

Operating Functions
The Nilight TR-155 LED Trailer Light Kit provides multiple lighting functions for safe trailer operation:
- Running Lights: Activated with vehicle headlights, providing continuous illumination.
- Stop/Brake Lights: Illuminate brightly when the vehicle's brakes are applied.
- Turn Signal Lights: Flash to indicate turns or lane changes.
- Side Marker Lights: Provide additional visibility along the sides of the trailer.
- License Plate Light: Illuminates the license plate for visibility.



Care and Maintenance
To ensure the longevity and optimal performance of your Nilight LED Trailer Light Kit, follow these maintenance guidelines:
- Regular Inspection: Periodically check all lights for proper function, including running, brake, turn signal, and marker lights.
- Wiring Check: Inspect wiring for any signs of wear, corrosion, or loose connections. Secure any loose wires and repair damaged insulation.
- Cleaning: Clean the light lenses regularly with a soft cloth and mild soap solution to remove dirt and debris. Avoid abrasive cleaners that could scratch the lens.
- Waterproofing: While the lights are highly waterproof, ensure that all seals and connections remain intact. The square lights feature water drainage notches; ensure these are not obstructed.
- Hardware: Periodically check mounting hardware for tightness and corrosion. Replace any corroded or damaged fasteners.

Troubleshooting
If you encounter issues with your trailer light kit, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Lights not illuminating | No power, faulty wiring, blown fuse, damaged light unit | Check vehicle's fuse box, verify all wiring connections (ground, positive), test light unit with a known good power source. |
| Lights dim or flickering | Poor ground connection, insufficient power, loose wiring | Ensure ground wire is securely attached to a clean, unpainted metal surface. Check for corrosion on terminals. Verify power supply. |
| Incorrect light function (e.g., brake light acts as turn signal) | Incorrect wiring connections | Re-check wiring against the provided diagram, ensuring each wire is connected to its correct function. |
| Water inside light housing | Damaged seal, obstructed drainage notch | Inspect seals for damage. Clear any obstructions from the water drainage notches. If damage is severe, replacement may be necessary. |
Product Specifications
- Model: TR-155
- Brand: Nilight
- Voltage: 12V DC
- Wattage: 4.44 watts
- Light Source Type: LED (2835 and 5050 SMD LEDs)
- Material: Polycarbonate Lens
- Waterproof Rating: Highly sealed and waterproof design with drainage notches
- Vehicle Service Type: Bus, Snowmobile, Trailer, Truck, RV, Marine, Pickups, Camper, Tractors
- Max Vehicle Width: 80 inches
- Item Weight: 2.97 pounds
- Package Dimensions: 15.79 x 10.79 x 5.08 inches
- Assembly Required: No
- Automotive Fit Type: Universal Fit
Warranty and Customer Support
Nilight products are designed for durability and performance. For warranty information or technical assistance, please refer to the official Nilight website or contact their customer support directly. Keep your purchase receipt for warranty claims.
For further assistance, visit the official Nilight store: Nilight Store on Amazon.





