Wiring a trailer for lights and brakes is essential for safe towing. We researched specifications, industry standards (SAE J1128 for wiring, FMVSS 108 for lighting), and owner reviews to compare the top trailer wiring kits with lights. Our evaluation focuses on connector quality, wire gauge, weather resistance, and included components. Not every kit fits every trailer, so we highlight who benefits most and who should skip each pick.
| Photo | Product | Score | Buy |
|---|---|---|---|
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CURT 56146 T-Connector Wiring Kit with Lights Top Pick Vehicle-specific T-connector with 4-pin flat output, includes tail light converter for some vehicles |
9.2 | 🛒 Check Price |
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Hopkins 47205 Towing Wiring Kit with LED Lights Best Value Universal 4-wire flat kit with LED trailer lights and mounting hardware |
8.8 | 🛒 Check Price |
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Wesbar 24140 Submersible LED Trailer Light Kit Best Waterproof Submersible LED tail light kit with 4-pin flat connector and 12-foot wiring harness |
8.5 | 🛒 Check Price |
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Optronics STL68RBP Red LED Trailer Light Kit Budget Pick Universal 4-wire kit with red LED tail lights, includes wiring and mounting hardware |
8.1 | 🛒 Check Price |
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Roadmaster 155 Trailer Wiring Kit with Lights Heavy Duty Heavy-duty 4-wire kit with sealed LED lights and 20-foot harness |
8.4 | 🛒 Check Price |
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Towing Solutions 2015 Universal Trailer Wiring Kit Compact Kit Universal 4-wire flat kit with LED lights and 10-foot harness |
7.8 | 🛒 Check Price |
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Pilot Automotive PL-7003 Trailer Light Kit Basic Kit Universal 4-wire kit with incandescent lights and 12-foot harness |
7.3 | 🛒 Check Price |
1. CURT 56146 T-Connector Wiring Kit with Lights: Top Pick
The CURT 56146 is a vehicle-specific T-connector kit that includes pre-assembled wiring and a 4-pin flat connector. In our evaluation, it stands out for ease of installation: owners report it snaps into place without cutting factory wires. The kit meets SAE J1128 standards for wire gauge and insulation. It also includes a tail light converter for vehicles with separate turn and brake signals, which is a common need on many European or older models.
However, this kit only fits specific vehicles (check fit guide). It does not include a 7-pin connector or brake controller provisions. For trailers requiring electric brakes, you will need a separate brake controller and a 7-pin upgrade. Skip this if you need a universal kit or have a vehicle not listed in the fitment guide.
- Plug-and-play installation with no splicing required for most vehicles
- Corrosion-resistant terminals and sealed housing meet SAE standards
- Includes both a 4-pin flat connector and a tail light converter module
Pros: Excellent fit for many popular trucks and SUVs; High-quality connectors resist corrosion
Cons: Not universal; requires correct vehicle model year
2. Hopkins 47205 Towing Wiring Kit with LED Lights: Best Value
The Hopkins 47205 is a universal wiring kit that comes with everything needed to add lights to a small trailer: two LED tail lights, side markers, license plate bracket, and a 4-wire harness. Based on owner feedback, the LED lights are bright and comply with DOT requirements. The harness is color-coded and pre-stripped, making it suitable for DIYers. We compared the wire gauge (16 AWG) to SAE J1128 recommendations and found it adequate for light-duty trailers.
However, the wiring is not weather-sealed; exposed splices must be taped or heat-shrunk to prevent corrosion. The included lights are basic and may not suit larger trailers needing additional side or clearance lights. This kit is best for boat trailers, utility trailers, or small campers. Skip it if you need a heavy-duty sealed harness or a 7-pin connector.
- Includes two LED tail lights, side marker lights, license plate bracket, and wiring
- Wire harness is color-coded and pre-stripped for easy connection
- LED lights are DOT compliant and provide bright, long-lasting illumination
Pros: Complete kit with lights for small trailers; LED lights offer low power draw and long life
Cons: Wiring is not waterproof; splices need to be sealed
3. Wesbar 24140 Submersible LED Trailer Light Kit: Best Waterproof
The Wesbar 24140 is designed for trailers that see water, like boat trailers. The LED lights are fully submersible and sealed against moisture, meeting IP67 standards based on spec sheets. We researched owner reviews and found high satisfaction with durability in saltwater environments. The 12-foot harness is pre-wired with a 4-pin flat connector, though some owners noted the wire becomes stiff in cold temperatures.
This kit is limited to tail lights only; it does not include side markers or license plate light. The mounting brackets are basic and may require modification for some trailers. It is best for boat trailers or utility trailers frequently backed into water. Skip it if you need a complete lighting set including side markers or if you operate in very cold climates where wire flexibility matters.
- Submersible design rated for underwater use (e.g., boat trailers)
- LED lights are sealed and corrosion-resistant
- Includes mounting brackets and pre-wired harness with 4-pin plug
Pros: Excellent water and corrosion resistance; Bright LED output with long lifespan
Cons: Harness is not as flexible in cold weather; Lights only; no side markers included
4. Optronics STL68RBP Red LED Trailer Light Kit: Budget Pick
The Optronics STL68RBP is a budget-friendly wiring kit that provides two red LED tail lights and a basic harness. In our evaluation, the lights meet DOT requirements and are reasonably bright for small trailers. The kit includes mounting brackets and a 4-pin flat connector. Owner reviews indicate it works well for light-duty trailers like small utility trailers or kayak trailers.
However, the wire gauge is 18 AWG, which is thinner than the 16 AWG recommended by SAE for longer runs. The harness is not weather-sealed, so splices must be protected. This kit lacks side marker lights and a license plate light. It is best for budget-conscious buyers with very small trailers. Skip it if you need a robust harness for a larger trailer or if you expect frequent exposure to moisture.
- Two red LED tail lights with built-in reflectors
- Includes 12-foot wiring harness with 4-pin flat connector
- DOT compliant and meets FMVSS 108 standards
Pros: Affordable complete kit; LED lights are bright and efficient
Cons: Wiring is thin (18 AWG) and may not be durable for heavy use; No side marker lights included
5. Roadmaster 155 Trailer Wiring Kit with Lights: Heavy Duty
The Roadmaster 155 is a heavy-duty kit designed for larger trailers that need a longer harness. The 20-foot 16 AWG wire is thicker than many competitors and the LED lights are fully sealed with polycarbonate lenses, offering good impact resistance. Owner feedback from RV and car hauler owners highlights reliability over time. The kit includes all necessary hardware and clear instructions.
However, this kit is not plug-and-play; it requires cutting and splicing into the tow vehicle’s wiring. It does not include a T-connector or module for vehicles with separate turn/brake signals. This makes installation more complex. It is best for DIYers comfortable with wiring or for trailers that are permanently wired. Skip it if you want a simple plug-and-play install or if your vehicle requires a converter.
- 20-foot heavy-duty 16 AWG wiring harness with sealed connectors
- Sealed LED lights with polycarbonate lenses
- Includes mounting hardware and detailed instructions
Pros: Long 20-foot harness suitable for larger trailers; Durable sealed components resist moisture and vibration
Cons: Installation requires splicing into vehicle wiring; No plug-and-play connector for modern vehicles
6. Towing Solutions 2015 Universal Trailer Wiring Kit: Compact Kit
The Towing Solutions 2015 is a compact universal kit aimed at small trailers like jet ski trailers or small utility trailers. The LED lights are small and have integrated reflectors, saving space. The 10-foot harness is color-coded and easy to connect. Owner reviews note that installation is straightforward for those with basic electrical knowledge.
However, the 10-foot harness is too short for many trailers, requiring extension or relocation of the lights. The lights are not sealed against moisture; several owners reported water ingress after rain. The wire gauge is 18 AWG, which is adequate for short runs but not for heavy loads. This kit is best for very small trailers with short distances. Skip it if you need a longer harness or waterproof lights.
- Compact LED lights with integrated reflectors
- 10-foot color-coded wiring harness with 4-pin flat connector
- Includes mounting brackets and self-tapping screws
Pros: Small footprint fits tight spaces; Easy to install with basic tools
Cons: Short 10-foot harness limits placement; Lights are not submersible and may leak
7. Pilot Automotive PL-7003 Trailer Light Kit: Basic Kit
The Pilot Automotive PL-7003 is a basic incandescent light kit for those on a tight budget. It provides two tail lights with amber turn signals and a 12-foot harness. In our evaluation, the light output is adequate for daytime use but dimmer than LED alternatives. The plastic housing is less robust than sealed LED units, and several owner reviews mention cracking after a few months.
The incandescent bulbs draw more current, which can be an issue with older vehicle wiring. The harness uses 18 AWG wire and is not weather-sealed. This kit is only suitable for temporary or very light-duty use where budget is the primary concern. Skip it if you want long-term durability or bright lights for night towing.
- Two red incandescent tail lights with amber turn signals
- 12-foot wiring harness with 4-pin flat connector
- Includes mounting brackets and wire connectors
Pros: Very low cost; Incandescent bulbs are easy to replace
Cons: Incandescent bulbs are less durable and dimmer than LED; Plastic housing is prone to cracking
Frequently Asked Questions
What wire gauge should I look for in a trailer wiring kit?
For most trailers, 16 AWG wire is recommended by SAE J1128 for runs up to about 20 feet. Thinner 18 AWG wire may be adequate for very short runs but can cause voltage drop and dim lights over longer distances. For heavy-duty or long trailers, 14 AWG is better. Always check the kit’s spec sheet and match it to your trailer’s length and light load.
Do I need a 4-pin or 7-pin connector?
A 4-pin flat connector provides basic lighting (tail, turn, brake, and ground). It is suitable for trailers without electric brakes or auxiliary power. A 7-pin round connector adds electric brake control, reverse lights, and a 12V power line. Choose based on your trailer’s requirements: if it has electric brakes, you need a 7-pin kit or an adapter. Many wiring kits are 4-pin, but you can upgrade with an adapter.
Are LED trailer lights better than incandescent?
Yes, LED lights are generally more durable, brighter, and draw less power. They also last longer and are less prone to vibration damage. However, they can be more expensive. For trailers frequently exposed to water or off-road conditions, LED is recommended. Incandescent bulbs are cheaper to replace but require more frequent maintenance and may not be as visible in bright sunlight.
Can I install a trailer wiring kit myself?
Many universal kits are designed for DIY installation with basic tools like wire strippers, crimpers, and electrical tape. However, if your vehicle has separate turn and brake signals (common on European cars), you may need a converter module. Vehicle-specific T-connectors are easiest. Always read the instructions and ensure you have the correct adapter for your vehicle’s wiring system. If unsure, consult a professional.
How do I ensure my trailer lights are weatherproof?
Look for kits with sealed LED lights and waterproof connectors. Submersible lights (like Wesbar) are best for boat trailers. For universal kits, use dielectric grease on connections and seal splices with heat-shrink tubing or silicone sealant. Avoid kits with exposed bulbs or unsealed housings if you tow in wet conditions. Also, ensure the wiring harness is routed away from sharp edges and heat sources.
Our Verdict
After researching specifications, safety standards, and owner feedback, the CURT 56146 T-Connector Wiring Kit with Lights earns our top pick for its plug-and-play ease and reliable performance. It is ideal for vehicle-specific fitment. For a complete value kit with lights, the Hopkins 47205 is a strong runner-up, offering LED lights and all necessary components for small trailers at a reasonable price.
