1. Introduction
Thank you for choosing the Wellmax 2PC 12V Universal LED Trailer Tail Lights. This manual provides essential information for the proper installation, safe operation, and maintenance of your new LED lights. Please read these instructions thoroughly before installation and retain this manual for future reference.
2. Safety Information
- Always disconnect the vehicle's battery before performing any electrical work to prevent electrical shock or damage.
- Ensure all wiring connections are secure and properly insulated to prevent short circuits and corrosion.
- Verify that the lights are compatible with your vehicle's 12V electrical system.
- Mount the lights securely to prevent detachment during vehicle operation.
- Consult a qualified technician if you are unsure about any installation steps.
3. Package Contents
- 2 x Wellmax 12V Universal LED Trailer Tail Lights (Model WM51051)
- Mounting hardware (nuts, washers, etc.)
4. Product Features
- Bright and Clear Lighting: Equipped with 38 ultra-bright LEDs, including 16 red LEDs for stop/turn/tail functions, 18 white LEDs for backup/reverse, and 4 additional white LEDs for license plate illumination.
- Multi-Functional Use: Designed to serve as stop, turn, tail, backup, and signal lights.
- Universal Compatibility: Suitable for a wide range of 12V vehicles and trailers, including trucks, short & extended trailers, RVs, boats, vans, buses, and flatbeds.
- Durable Construction: Features PMMA sonic-welded lenses and ABS housing for weatherproof protection against water, shock, and vibration. Rated IP65 waterproof.
- Long Lifespan: LEDs are designed for a lifespan of up to 100,000 hours.
- Easy Installation: Utilizes a 3-stud mount design and a 4-color wire system for straightforward setup.
5. Installation
The Wellmax LED Trailer Tail Lights are designed for a 3-stud mount installation. Follow these general steps for proper mounting and wiring:
5.1 Mounting
- Identify the desired mounting location on your vehicle or trailer. Ensure the surface is flat and provides adequate space for the light.
- Align the light and mark the positions for the three mounting studs.
- Drill appropriate holes for the studs.
- Secure the light using the provided nuts and washers. Ensure a tight fit to prevent movement and maintain the weatherproof seal.
5.2 Wiring Diagram
The lights feature a 4-color wire system for connection to your vehicle's electrical system. Refer to the diagram below and the wire color codes:

Figure 1: Wiring Connection Diagram and Dimensions
- White Wire: Ground
- Red Wire: Brake Lights / Turn Lights (Activates 16 red LEDs)
- Yellow Wire: Back-up Lights (Activates 18 white LEDs)
- Black Wire: Tail Lights (Activates 4 red LEDs for running lights)
Connect each wire to the corresponding function on your vehicle's wiring harness. Use appropriate connectors and ensure all connections are waterproof.
5.3 Universal Fit and Customization
These lights are designed for universal fit on most 12V vehicles and trailers. For specific vehicle models like Jeep YJ JK, Jeep CJ CJ-7 CJ-5, minor modifications may be required to ensure proper fit and function. This may include adjusting mounting points or extending wiring. Always ensure that any modifications comply with local regulations and safety standards.
6. Operating Instructions
Once properly installed and wired, the Wellmax LED Trailer Tail Lights will operate in conjunction with your vehicle's electrical system:
- Tail Lights: When your vehicle's headlights or running lights are activated, the black wire will power the 4 red LEDs for continuous illumination.
- Brake Lights: When the brake pedal is pressed, the red wire will activate the 16 red LEDs at full brightness.
- Turn Signals: When the turn signal is activated, the red wire will flash the 16 red LEDs on the corresponding side.
- Backup/Reverse Lights: When the vehicle is shifted into reverse, the yellow wire will activate the 18 white LEDs for bright rear illumination.
- License Plate Illumination: The 4 dedicated white LEDs will illuminate your license plate when the tail lights are active.
Observe the lights' operation after installation to confirm all functions are working correctly.
Product Demonstration Video
Official product demonstration video for Wellmax LED Trailer Tail Lights, showcasing their various lighting functions and features.
7. Maintenance
- Cleaning: Regularly clean the light lenses with a soft cloth and mild soap and water to maintain optimal light output. Avoid abrasive cleaners.
- Inspection: Periodically check all wiring connections for tightness and signs of corrosion. Inspect the housing and lenses for any cracks or damage.
- LED Lifespan: The LEDs are designed for long-term use and typically do not require replacement. If a light fails, the entire unit may need to be replaced.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Light does not illuminate | Loose or incorrect wiring connection, blown fuse, faulty ground connection, insufficient power supply. | Check all wiring connections for tightness and correct polarity. Inspect vehicle's fuse box for blown fuses. Ensure a solid ground connection. Verify 12V power supply. |
| Light is dim or flickers | Poor electrical connection, corrosion on terminals, low voltage from vehicle, damaged wiring. | Clean and secure all connections. Check vehicle's charging system for proper voltage output. Inspect wiring for damage. |
| Incorrect light function (e.g., brake light activates with turn signal) | Incorrect wiring, vehicle's electrical system issues (e.g., bad ground in vehicle harness). | Review the wiring diagram and ensure each wire is connected to its correct function. Consult a vehicle electrical specialist if the issue persists. |
9. Specifications
- Brand: Wellmax
- Model: WM51051
- Voltage: 12V DC
- LED Count: 38 LEDs total (16 Red, 18 White, 4 License Plate)
- Functions: Stop, Turn, Tail, Backup, Signal, License Plate Illumination
- Material: PMMA Sonic-Welded Lenses, ABS Housing
- Waterproof Rating: IP65
- Dimensions (Approx.): 6.68 inches (Height) x 5.75 inches (Width) x 2.82 inches (Depth)
- Item Weight: 2.82 pounds (per pair)
- Automotive Fit Type: Universal Fit
10. Warranty and Support
Wellmax stands by the quality of its products. For any questions, concerns, or support needs regarding your LED Trailer Tail Lights, please contact Wellmax customer service. While specific warranty details are not provided in this manual, our commitment to customer satisfaction ensures assistance with product-related inquiries.
11. Additional Product Images






