Chat with us, powered by LiveChat


4 Wire Trailer Wire

Get the Best 4 Wire Trailer Wire From China!

GLZW is your source for premium quality 4 wire trailer wiring direct from China. Our trailer wire is constructed of robust materials and is designed to last in even the most challenging conditions. Get the highest quality 4-wire trailer wiring available today at unbeatable prices.

  • Cable

    Why Choose GLZW's 4 Wire Trailer Cable?

Why Choose GLZW's 4 Wire Trailer Wire?
7 Wire Trailer Cable Price
  • Cable

    4 Wire Trailer Cable Price

When purchasing 4 wire trailer cables, the price range can vary greatly depending on the wire’s brand, length, and gauge. Generally, a 4 wire trailer cable can range from $20 to $100.

However, the price can be higher or lower depending on where you purchase the wire and the cable quality. It’s important to note that while you can find cheaper options, investing in a high-quality 4 wire trailer cable with durable PVC sheathing is essential for the safety and protection of your vehicle and your cargo.

List of Standard Specifications for 4 Wire Trailer Cable

Wire Gauge20 AWG
Number of Cores4
Conductor MaterialStranded Copper
Insulation MaterialPVC
Outer Sheath MaterialPVC
Rated Voltage60V DC
Temperature Range-40℃ to +85℃
Color CodingBrown, Green, Yellow, White
Roll Length100ft or 500ft
CertificationsRoHS, CE, UL

4 Wire Trailer Cables for Sale

Related Product Recommendation

Tray Cable

Tray Cable

Tray Cable Get High Quality Tray Cable from GLZW! Are you looking for reliable and high-quality tray cables in China?...

Read More
7 Wire Trailer Cable

7 Wire Trailer Cable

7 Wire Trailer Cable Get High Quality 7 Wire Trailer Cable from GLZW Today! Are you tired of unreliable trailer...

Read More

The Ultimate Guide to 4 Wire Trailer Cable

Get ready to wire your trailer like a pro! GLZW’s Ultimate Guide to 4 Wire Trailer Wire is your one-stop shop for all the necessary information. This comprehensive guide contains everything from basic installation instructions and wiring diagrams to technical tips and best practices.

What is 4 Wire Trailer Wire and Why is it Important?

What is 4 Wire Trailer Wire and Why is it Important?

A 4-wire trailer wire, also known as a 4-core trailer wire, is a crucial component of any trailer’s electrical system, specifically for its braking and safety systems. It serves as the link between the vehicle towing the trailer and the trailer itself. The wire is responsible for powering the trailer’s running, turn, and brake lights, which is essential for safety and road compliance. Without the 4 wire trailer wire, the trailer would not be roadworthy.

Understanding the Basics of 4 Wire Trailer Wire

The 4-wire trailer wire is a cable with four conductors enclosed in a high-quality PVC sheath, making it durable, flexible, and resistant to abrasion and oxidation. The four conductors have different colors, which guide the wiring process and determine their function. Correctly wiring the 4 wire trailer wire is essential to ensure the trailer’s lights and brake systems work perfectly.

Why is 4 Wire Trailer Wire Essential for Proper Trailer Functionality?

The 4 wire trailer wire ensures the proper functionality of a trailer’s lighting and braking systems. These lights and brake systems are essential for safe operation and compliance with road regulations. Without the 4 wire trailer wire, the trailer lights would not work, the brakes may not function correctly, and the vehicle towing the trailer would be at risk.

Benefits of Using 4 Wire Trailer Wire

Using a 4-wire trailer wire comes with several benefits. Firstly, the wire’s flexible construction can withstand harsh environmental conditions, such as extreme temperatures and rough roads. Secondly, due to its high-quality PVC sheath, the cable’s conductors are insulated from oxidation, which can potentially interfere with the transmission of electrical signals. Lastly, the wire’s color-coded conductors make identifying and troubleshooting any issues during installation or maintenance easier.

Choosing the Right 4-Wire Trailer Wire Connector

When selecting a 4-wire trailer wire connector, choosing one compatible with your trailer and towing vehicle is essential. The connector should match the connector type on the towing vehicle, whether it is a 4-way, 5-way, or 7-way connector. Additionally, the connector should be weather-resistant and durable to withstand harsh road conditions.

Common Issues with 4 Wire Trailer Wire and How to Troubleshoot Them

A 4-wire trailer wire is essential to any trailer’s electrical system. However, like any other electrical component, it is not immune to issues arising during use. These problems may include faulty connections, worn-out wires, and blown fuses. If you encounter any of these issues, it is crucial to troubleshoot them immediately to avoid any safety risks resulting from a malfunctioning electrical system. This paragraph will discuss the common problems you may encounter when dealing with a 4-wire trailer wire.

One common issue with a 4-wire trailer wire is a faulty connection. This may occur when the connecting cables are not tightly secured, leading to a poor connection. As a result, you may experience issues such as flickering lights, no lights at all, or intermittent lighting. To solve this problem, ensure the wires are firmly connected by tightening loose screws or bolts.

Another common issue is worn-out wires. Trailers are exposed to harsh weather conditions, and the constant exposure may result in worn-out wires. The cables may break or develop cracks and cuts, leading to short electrical circuits. You may need to replace the damaged wires with new ones to fix this issue.

Blown fuses are also a common issue with a 4-wire trailer wire. Fuses protect the electrical system from overloading and can blow due to a sudden power surge or an electrical fault. To solve this problem, you must identify the blown fuse and replace it with a new one.

What Is The Color Code For A 4 Wire Trailer Wire?

GREENRight Turn/ Brake Light18Vehicle's wiring harness - right turnTrailer's right turn signal
YELLOWLeft Turn/ Brake Light18Vehicle's wiring harness - left turnTrailer's left turn signal
BROWNTail/Running Lights18Vehicle's wiring harness - taillightTrailer's taillights
WHITEGround16Vehicle ground point -uncoated metalTrailer ground point ~ uncoated metal

A 4 wire trailer wire is crucial to any trailer’s electrical structure, particularly in the braking and safety systems. To ensure the wire is installed correctly, it is essential to understand the 4-wire trailer wire’s color coding. Each 4-core trailer wire has a color indicating a specific function. These colors include brown, green, yellow, and white. Each wire connects the trailer’s running lights, brake lights, turn signals, and ground. Interpreting the wire’s color code correctly ensures that the connection functions appropriately.

How To Wire 4 Wire Trailer Wire?

Wiring a 4-wire trailer wire might seem overwhelming for some, but it is not impossible, even for non-electricians. Knowing the color coding of the cables is the first step to ensuring that the connection is correct. The recommended minimum gauge of a 4-core trailer wire is 18 AWG for the turn, brake, and running lights and 16 AWG for the ground wire. Before wiring the trailer, it is vital to check the vehicle owner’s manual for specific insights on the connection’s components. Once the appropriate gauge of the wire is confirmed, wiring the trailer is straightforward, following the color code particular to each wire’s function.

Why Does My Trailer Have 4 Wires?

A trailer has four wires to ensure the proper functioning of its electrical system, particularly the braking and safety systems. These wires connect the trailer to the tow vehicle’s running lights and indicate the trailer’s brake lights and turn signals. The brown wire connects the tail or parking lights, while the green wire links to the right turn signal and brake lights. On the other hand, the yellow wire links to the left turn signal and brake lights, while the white wire connects to the standard or chassis ground. Each wire serves a specific function and is crucial in ensuring the trailer’s proper and safe operation. Understanding why a trailer has four wires is essential for maintaining the trailer’s electrical system and ensuring passenger safety.

How to Install and Wire a 4-Wire Trailer?

How to Install and Wire a 4-Wire Trailer?

Installing and wiring a 4-wire trailer is not as complicated as it may seem. You can get the job done quickly with the right tools and knowledge. Here is a step-by-step guide to wiring a 4-wire trailer.

Step 1: Gather the necessary tools. You will need a wire stripper, crimping tool, electrical tape, and a circuit tester.

Step 2: Identify and match the wire colors. As mentioned earlier, a 4 wire trailer cable has four different colors. The brown wire connects the tail or parking lights; the green wire connects the right turn signal and brake lights; the yellow wire links to the left turn signal and brake lights; and the white wire links to the common ground. Make sure to match the colors correctly.

Step 3: Cut and strip the wires. Use a wire stripper to remove the insulation from the wires. Ensure that the exposed wire is long enough to make a secure connection.

Step 4: Connect the wires. Use a crimping tool to connect the cables to the adequately labeled terminals on the trailer connector. Use electrical tape to secure the connections.

Step 5: Test the lights and brakes. Once the wiring is complete, use a circuit tester to check if the lights and brakes work correctly. If there are any issues, troubleshoot the problem and make the necessary adjustments.

What are the Correct Wire Colors for 4 Wire Trailer Wiring?

As previously stated, the correct wire colors for 4-wire trailer wiring are brown, green, yellow, and white. Each color serves a specific function and must be matched correctly during installation. A brown wire connects the tail or parking lights; a green wire connects the right turn signal and brake lights; yellow wire links to the left turn signal and brake lights, and white wire links to the common ground. Misinterpreting the color coding may result in blown fuses and incorrect functioning of the trailer.

Tips for Properly Connecting the 4-Wire Trailer Harness

To properly connect the 4-wire trailer harness, use the correct gauge wire. The minimum recommended gauge for the turn, brake, and running lights is 18 AWG; for the ground wire, the recommended size is 16 AWG. Check your vehicle owner’s manual for specific recommendations before connecting the trailer harness. Use wire strippers to expose the insulated wire evenly and crimping tools for a secure connection. It’s also important to use electrical tape to secure the connections and prevent any risk of short circuits.

How to Test the Lights and Brakes of a 4-Wire Trailer?

After wiring the 4 wire trailer, it’s essential to test the lights and brakes to ensure they function correctly. Using a circuit tester, test the running lights, brake lights, and turn signals to confirm that they are working. Also, check the brake controller to ensure it is synced with the tow vehicle. If any issues arise, troubleshoot the problem, and make the necessary adjustments.

Extra Precautions to Consider When Wiring a 4-Wire Trailer

When wiring a 4-wire trailer, adhere to safety precautions. Use protective gear such as gloves and goggles and ensure no exposed wires are touching. Do not wire a trailer in wet conditions; always disconnect the battery before starting any electrical work. When connecting the trailer to the tow vehicle, ensure that the hitch and wiring are secure and that the trailer’s weight does not exceed the tow vehicle’s capacity. By following these extra precautions, you can ensure that your trailer is safe and functional.

Common Wiring Problems and Solutions for 4 Wire Trailers

Common Wiring Problems and Solutions for 4 Wire Trailers

Trailer wiring is a complex system that is prone to a variety of issues and malfunctions. The most common wiring problems in 4-wire trailers include poor connections, faulty wiring, and damaged wires. The good news is that these issues can be identified and fixed with the right tools and knowledge. If you are experiencing any wiring problems, it is essential to address them promptly to avoid further damage or safety hazards.

Identifying and Fixing Faulty Wiring Connections

One of the most common wiring issues in 4-wire trailers is faulty connections. These can occur when the wires or the trailer’s lighting system are not securely connected. Symptoms of faulty wiring connections include dim or flickering lights or lights that do not turn on. To identify the problem, check all the links and wiring for any signs of damage or wear. If you find any issues, replace or repair the damaged components immediately.

What to Do When the Trailer Lights are Not Working

Trailer lights not working is a common issue that many people experience when towing a trailer. Various factors, including faulty bulbs, poor wiring connections, or a damaged lighting system, can cause this. To troubleshoot the problem, check the bulbs and replace any burned-out. If the problem persists, check all the wiring connections and repair or replace any damaged ones. If the lights do not work, replacing the entire lighting system may be time.

Troubleshooting Brake Issues in a 4-Wire Trailer

Brake issues in a 4-wire trailer can be challenging to diagnose and fix. Some common symptoms include a weak or non-existent braking system or brakes that engage too quickly or slowly. Check the brake wiring and connections for any damage or wear to troubleshoot the issue. You should also check the brake controller and adjust it according to the manufacturer’s instructions. If these solutions do not work, it may be time to seek the help of a professional trailer mechanic.

Dealing with Corroded or Damaged Trailer Wiring

Corroded or damaged trailer wiring is a common issue that can cause various problems. Corrosion can occur when the wiring is exposed to moisture or other elements, while damage can occur from wear and tear or accidents. Symptoms of this problem include flickering or dim lights or lights that do not work. To fix this issue, replace the corroded or damaged wiring and install new wiring that is adequately protected from the elements.

Ensuring Grounding is Properly Established in 4 Wire Trailers

Grounding is a critical aspect of any trailer wiring system. Without proper grounding, the system can malfunction and cause various problems. Symptoms of poor grounding include lights that flicker or do not work or brakes that do not engage properly. To ensure proper grounding, ensure that the ground wire is attached securely to the trailer’s chassis and that there is no rust or corrosion on the connection. You should also check the wiring system for any loose connections or damaged wires and repair or replace them as needed.

Understanding Different Connectors for 4 Wire Trailers

Trailer Wiring Diagram

4 Wire Trailers need appropriate connectors to function effectively. The connectors come in different types, each serving a specific purpose. Understanding the other connectors for 4 Wire Trailers is essential for anyone who owns a trailer. 

Exploring the Types of 4 Wire Trailer Plugs 

4 Wire Trailer Plugs are the most common connectors for 4 Wire Trailers. They come in different types, each with a unique wiring configuration. However, the most common types of 4 Wire Trailer Plugs are the 4 Pin and the 5 Pin connectors. Understanding the difference between these two types is crucial when making a selection.

Comparing 4 Pin and 7-Way Trailer Connectors

The 4 Pin Connector is the most basic connector type for 4 Wire Trailers. It features four pins, with each pin serving a specific function. However, the 7-Way Trailer Connector is a more advanced connector with seven pins. The additional pins in the 7-Way Connector allow for more functionality, which makes it ideal for larger trailers.

What is a 4-Wire Flat Connector and How Does it Work?

A 4-Wire Flat Connector is another type of connector for 4 Wire Trailers. It is a more basic connector type with four wires, one for each function – left turn signal, right turn signal, brake lights, and running lights. The connector gets its name from its flat shape, making it ideal for smaller trailers.

The Role of Wiring Kits in 4 Wire Trailer Connections

Wiring Kits are essential when connecting a 4 Wire Trailer to a towing vehicle. They come with all the necessary components to complete a connection, including connectors, wires, and electrical components. Wiring Kits are available in different sizes, making it easy to find one that fits the specific needs of your trailer.

Critical Considerations for Selecting the Right Trailer Connector

Selecting the correct connector for your 4 Wire Trailer is crucial for optimal functionality and safety. Key considerations when choosing a connector include the trailer size, type of towing vehicle, compatibility with other trailers, and the number of electrical components required. It is also essential to consider the weather resistance and durability of the connector to ensure longevity. Consulting a professional is always recommended when making a decision.

Contact GLZW

Contact Form Demo (#3)

Frequently Asked Questions

A: A 4-wire trailer wire, also known as a 4-pin trailer wire, is a wiring harness that connects a trailer to a towing vehicle. It consists of four wires that are color-coded for easy installation and connection.

A: The four colors commonly found in a 4-wire trailer wire are brown for running lights, yellow for a left turn and brake lights, green for a right turn and brake lights, and white for ground.

A: To connect a 4-wire trailer wire to your towing vehicle, you must use a 4-pin connector. The connector can be plugged into the towing vehicle’s wiring harness, and the corresponding wires from the trailer wire can be connected to the appropriate terminals.

A: A 4-wire trailer wire is specifically designed for trailer lights. It provides the necessary connections for running lights, turn signals, and brake lights.

A: A trailer wiring harness is a set of cables and connectors that allow the towing vehicle to power the trailer’s lights and electrical components. It ensures a secure and reliable connection between the two.

A: A 4-pin trailer wire can be used for a boat trailer. It provides the necessary connections for the trailer’s lights, regardless of the type of trailer.

A: The main difference between a 4-wire trailer wire and a 5-wire trailer wire is. A 4-wire trailer wire has four wires, while a 5-wire trailer wire has five. The additional wire in a 5-wire trailer wire is usually used for other functions, such as backup lights or electric brakes.

A: Using a wiring kit for a 4-wire trailer wire installation is recommended. The wiring kit includes all the necessary components, such as connectors, cables, and instructions, to ensure a proper and secure installation.

A: It is possible to upgrade from a 4-wire trailer wire to a 7-pin trailer wire. However, it may require additional wiring and connectors, depending on the towing vehicle and trailer’s compatibility. It is recommended to consult a professional or refer to the car and trailer’s wiring diagrams for proper installation.

4 Wire Trailer Wires Expert
4 Wire Trailer Wires Expert
Address: No.218 of Pengping Road, Shaochang Town, Fengxian District, Shanghai,China
OEM Services
Scroll to Top
Contact Form Demo (#3)