Oyviny 5 Way Flat Trailer Wiring Harness Plug
4.6Editor score
22 Inch wire lead length
Corrosion resistant brass terminals
Color coded bonded wires
In this guide
Finding a reliable 5 Way Flat Trailer Wiring Harness Plug is essential for safe towing and proper lighting function on your trailer. A good harness ensures clear communication between your vehicle and trailer lights including brake signals turn indicators and reverse lights.
We compared ten top rated models based on wire gauge, connector durability, and ease of installation. Our analysis focuses on corrosion resistance, wire length, and compatibility with standard 5 pin trailer sockets used across marine and utility applications.
Each pick below highlights specific strengths like split wire designs or extra length for flexible routing. Keep in mind that product availability and pricing can change so always verify details on the retailer site before purchasing for your specific towing needs.
Top 3 Picks for Best 5 Way Flat Trailer Wiring Harness Plug
RED WOLF 5-Way Flat Trailer Wire Harness
4.7Editor score
Male and female extension set
18 AWG heavy duty wiring
Split wire design option
Oyviny 5 Way Flat Trailer Wire Extension
4.7Editor score
48 inch extra length cable
Rubber molded connectors
Universal 5 pin socket fit
Top 10 Best 5 Way Flat Trailer Wiring Harness Plug in 2026 Compared
The following table provides a side by side overview of all ten selected products focusing on key specifications like wire length, gauge, and connector type to help you quickly identify the best match for your trailer setup.
ProductsSpecificationsEditor scorePrice
Editor's Choice
Oyviny 5 Way Flat Trailer Wiring Harness Plug
22 Inch wire lead
18 AWG wire gauge
Male connector type
Dust cover included
4.6Editor score
Editor's Choice
RED WOLF 5-Way Flat Trailer Wire Harness
Male and female set
22 and 31 inch
18 AWG wire gauge
Color coded bonding
4.7Editor score
Best Premium
Oyviny 5 Way Flat Trailer Wire Extension
48 Inch total length
18 AWG wire gauge
Male and female ends
Rubber molded housing
4.7Editor score
5 Pin Trailer Connector 14AWG Pure Copper Wire
25 Inch wire length
14 AWG wire gauge
Pure copper wires
Split wire design
4.2Editor score
Oyviny 4 Pin 5 Wire Trailer Wiring Harness
18 Inch short length
16 AWG wire gauge
Y split design
4 pin flat plug
4.9Editor score
5 Way Flat Trailer Wiring Harness Plug 22 inch
22 Inch wire length
18 AWG wire gauge
Male connector type
Brass tinned terminals
4.6Editor score
5 Way Trailer Connector Wire 40 inch Jacketed Cable
40 Inch wire tail
18 AWG wire gauge
Jacketed cable sheath
Male connector type
4.3Editor score
CURT 58550 Vehicle-Side and Trailer-Side 5-Pin Flat Wiring Harness
72 Inch wire lead
16 AWG wire gauge
Ergonomic grip design
Vehicle and trailer side
4.7Editor score
Nilight 5 Way Flat Trailer Wiring Harness Plug 22inch Wire
22 Inch wire length
18 AWG wire gauge
Blunt cut wires
Heavy duty plug
4.9Editor score
Oyviny Vehicle-Side 5 Way Flat Trailer Wiring Harness Female Plug Connector
31 Inch wire loop
Female plug connector
Bonded wire design
Dust cover included
4.7Editor score
1. Oyviny 5 Way Flat Trailer Wiring Harness Plug – Best Overall Choice
Oyviny 5 Way Flat Trailer Wiring Harness Plug
22 Inch wire lead
18 AWG gauge
Brass tin terminals
Split wire option
This Oyviny harness offers a reliable solution for connecting trailer lights with its durable 22 inch lead and color coded wires. Rated highly by users it ensures consistent signal transmission for brake and turn functions across various trailer types including marine setups.
Pros
- Pre-stripped wires for quick install
- Durable brass construction
- Color coded for clarity
- Ergonomic grip tabs
- Waterproof dust cover
Cons
- Shorter length for some vehicles
- Plastic housing may crack
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The split wire design allows direct connection to taillights without jumper wires which simplifies routing and reduces potential failure points. Pure copper wires with tin plated brass terminals provide excellent conductivity and resist corrosion in harsh weather conditions.
While the length is standard for many setups it may require extension for vehicles with deep trunks or complex routing. The plastic housing is sturdy but can crack under extreme impact compared to rubber molded alternatives found in premium models.
Ideal for DIY enthusiasts seeking a balance of quality and ease of use this plug is a strong recommendation for standard utility and boat trailers needing quick reliable connections without complex splicing tasks.
Simplified Wiring with Split Design
The split wire feature eliminates the need for jumper wires across the axle making installation cleaner and more efficient for most users.
Corrosion Resistance
Tin plated brass terminals ensure long lasting performance even in salty or wet environments typical for marine trailers.
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2. RED WOLF 5-Way Flat Trailer Wire Harness – Complete Set Option
RED WOLF 5-Way Flat Trailer Wire Harness
Male and female set
22 and 31 inch
18 AWG wire
Bonded loop wire
The RED WOLF kit provides both male and female connectors allowing for flexible extension and replacement scenarios. This dual setup is particularly useful for vehicle that need to store the connector inside the trunk while keeping a plug ready for the trailer.
Pros
- Includes both male and female ends
- Longer female lead for trunk storage
- Heavy duty bonding
- Easy splice points
- Versatile application range
Cons
- Slightly higher price point
- Female end may be bulky
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With 18 AWG heavy duty bonding the wires maintain integrity under vibration and stress. The female end being 31 inches gives ample slack for routing through vehicle frames without stretching the cable excessively during towing.
Users note that while the quality is high the female connector can be bulkier than standard plugs which might require careful placement in tight spaces. The price reflects the added value of having a complete pair rather than a single end.
This harness is best for owners who need to replace both ends of a broken system or want the convenience of an adapter that keeps the vehicle socket protected inside the car.
Vehicle Socket Protection
Keeping the vehicle connector in the trunk using the female adapter prevents weather damage and keeps the socket ready for quick connections.
Flexible Length Options
The combination of 22 inch male and 31 inch female leads offers versatile routing options for different vehicle and trailer configurations.
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3. Oyviny 5 Way Flat Trailer Wire Extension – Extra Length Model
Oyviny 5 Way Flat Trailer Wire Extension
48 Inch loop length
18 AWG gauge
Rubber molded plugs
Universal fit
This extension harness stands out with its 48 inch wire loop which provides significant flexibility for routing across larger vehicles or trailers. The rubber molded connectors add a layer of protection against impacts and water intrusion common in outdoor towing environments.
Pros
- Extra 48 inch length for routing
- Rubber housing for durability
- Plug and play installation
- Both sides compatible
- Good conductivity wires
Cons
- Extra length may need coiling
- Bulkier than standard plugs
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Universal compatibility ensures it fits standard 5 way flat sockets on most tow vehicles and trailers. The bonded wires are color coded for quick identification of ground brake and turn signals during installation or troubleshooting.
While the length is a major advantage it can result in excess cable that needs to be neatly secured to prevent tangling or dragging on the road. The bulkier rubber plugs might not fit into very tight connector housings without modification.
Choose this extension if your vehicle requires extra reach to the rear or if you need a robust replacement that offers better weather resistance than basic plastic plugs.
Weather Resistant Design
The rubber molding on the connectors enhances waterproofing ensuring reliable operation even in heavy rain or when washing the vehicle.
Flexible Installation
With 48 inches of wire you can route the harness through frame rails or under the chassis without strain on the connection points.
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4. 5 Pin Trailer Connector 14AWG Pure Copper Wire – Heavy Gauge Model
5 Pin Trailer Connector 14AWG Pure Copper Wire
25 Inch wire length
14 AWG wire gauge
Pure copper core
Split wire design
This connector features 14 AWG pure copper wires which are thicker than the standard 18 AWG found in many other harnesses. The increased gauge reduces resistance and heat buildup making it suitable for longer runs or high load lighting applications.
Pros
- Thicker 14 AWG wires
- Pure copper for conductivity
- Dust cover included
- Split wires for direct connect
- PVC insulation quality
Cons
- Fewer customer reviews
- Price may vary
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The split wire design allows for direct connection to taillights avoiding the need for cross axle wiring. The PVC insulation resists abrasion and aging ensuring the wires remain intact even when exposed to rough terrain or debris.
However fewer user reviews mean there is less community validation of its long term durability compared to top rated brands. The thicker wires can be slightly harder to strip and splice for beginners unfamiliar with heavy gauge wiring.
This option is excellent for users prioritizing electrical performance and durability over cost and who require a more robust conductor for demanding towing conditions or longer cable runs.
Enhanced Conductivity
The 14 AWG pure copper construction ensures minimal voltage drop over distance keeping lights bright even at the far end of long trailers.
Protective Insulation
Thick PVC insulation shields the copper from physical damage and corrosion extending the overall lifespan of the harness in harsh conditions.
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5. Oyviny 4 Pin 5 Wire Trailer Wiring Harness – 4 Way Flat Replacement
Oyviny 4 Pin 5 Wire Trailer Wiring Harness
18 Inch short length
16 AWG wire gauge
Y split design
4 pin flat plug
This 4 pin 5 wire harness offers a high quality replacement for smaller utility trailers with 4 way flat sockets. It features a Y split design that simplifies routing to both taillights without crossing wires over the axle which improves reliability.
Pros
- Highest rating among options
- 16 AWG pure copper wires
- Y split for taillights
- Ergonomic grip tabs
- Short length for compact use
Cons
- 4 pin not 5 pin
- Shorter wire length
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The 16 AWG pure copper wires provide excellent conductivity and the ergonomic tabs make plugging and unplugging easier even with gloves on. The dust cover helps protect the connector from moisture and debris when not in use.
While rated highly it is important to note this is a 4 pin version which does not support reverse lights found on 5 pin systems. The shorter 18 inch length limits its use to trailers close to the hitch without extensions.
Ideal for boat or utility trailers that only need basic lighting functions this plug ensures a solid reliable connection with minimal installation complexity for standard 4 pin applications.
Efficient Taillight Wiring
The Y split design allows direct wiring to left and right taillights eliminating the need for additional jumpers or complex routing across the vehicle.
Superior Build Quality
High ratings reflect the quality of the copper conductors and durable housing that withstand regular towing wear and tear effectively.
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6. 5 Way Flat Trailer Wiring Harness Plug 22 inch – Budget Friendly Option
5 Way Flat Trailer Wiring Harness Plug 22 inch
22 Inch wire length
18 AWG wire gauge
Brass tinned terminals
Male connector type
This harness offers a straightforward solution for standard 5 pin connections at a competitive price point. The 22 inch lead and 18 AWG wire provide adequate power for most utility and cargo trailers without extra bulk or complexity.
Pros
- Affordable pricing
- Standard 22 inch length
- Brass construction
- Good for basic use
- Easy to find
Cons
- Basic packaging
- Fewer features
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Corrosion resistant brass terminals ensure a solid connection that holds up well in normal weather conditions. It serves as a reliable replacement for worn out plugs where cost is a primary consideration for the buyer.
Basic functionality means it lacks some of the advanced features like split wires or extra lengths found in pricier models. Users should verify compatibility carefully as packaging can be minimal and instructions may be limited.
This option is best for those needing a simple direct replacement for a broken plug where budget constraints are significant and no additional routing flexibility is required.
Cost Effective Solution
An economical choice for basic towing needs ensuring you get a functional connection without overspending on unnecessary extras or features.
Standard Compatibility
Designed to fit industry standard 5 way flat sockets so it works with most common vehicle and trailer lighting configurations.
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7. 5 Way Trailer Connector Wire 40 inch Jacketed Cable – Longer Jacketed Model
5 Way Trailer Connector Wire 40 inch Jacketed Cable
40 Inch wire tail
18 AWG wire gauge
Black cable sleeve
Waterproof sheathing
This harness features a 40 inch wire tail with a black protective sheathing that conceals individual wire colors for a cleaner look. The jacketed design adds extra protection against abrasion and environmental factors that could damage exposed wires over time.
Pros
- Long 40 inch lead
- Jacketed wire protection
- Hidden wire colors
- Ergonomic grip tabs
- Good for deep routing
Cons
- Bulkier cable design
- Less flexible wire
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With 18 AWG conductors it maintains standard performance levels while offering more length for routing. The ergonomic tabs on the plug make it easy to secure or release the connection without straining your fingers.
The bulkier cable may be less flexible than standard flat wires which can make routing through tight spaces more difficult. Users should account for the extra thickness when planning paths through vehicle frames or tight harnesses.
Choose this model if you need extra length and additional physical protection for the wires in rough terrain or when aesthetics of hidden wiring are preferred.
Extra Wire Protection
The black sheathing protects the internal wires from scrapes and UV exposure ensuring consistent performance even in demanding towing environments.
Extended Reach
The 40 inch length provides ample slack for complex routing needs ensuring the connector reaches easily without tension on the wires.
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8. CURT 58550 Vehicle-Side and Trailer-Side 5-Pin Flat Wiring Harness – Long Lead Brand Name
CURT 58550 Vehicle-Side and Trailer-Side 5-Pin Flat Wiring Harness
72 Inch wire lead
16 AWG wire gauge
Ergonomic grip design
Vehicle and trailer side
CURT is a well known brand in the towing industry and this harness delivers with 72 inch wires for extensive routing flexibility. The 16 AWG gauge provides robust electrical capacity suitable for heavy duty towing and larger trailer lighting systems.
Pros
- Very long 72 inch wires
- Trusted CURT brand
- 16 AWG durability
- Ergonomic connector tabs
- Complete vehicle set
Cons
- Higher price point
- More weight than others
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Ergonomic design on the connectors ensures a secure grip during plugging which is helpful when working in tight spaces or with cold hands. The set includes both vehicle and trailer side connectors for a comprehensive replacement solution.
The price reflects the brand quality and extra wire length but it might be more than needed for simple short distance towing applications. The additional wire length requires careful management to avoid drag and clutter when not connected.
This harness is ideal for professionals or frequent towers who need reliable long reach connections and trust in a proven brand name for safety and durability.
Brand Reliability
CURT products are known for industry standards ensuring a trustworthy choice for critical safety components like trailer wiring systems.
Maximum Routing Flexibility
72 inches of lead allows routing through almost any vehicle frame ensuring you can reach connection points regardless of design constraints.
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9. Nilight 5 Way Flat Trailer Wiring Harness Plug 22inch Wire – High Rated Simple Plug
Nilight 5 Way Flat Trailer Wiring Harness Plug 22inch Wire
22 Inch wire length
18 AWG wire gauge
Blunt cut wires
Heavy duty plug
Nilight offers a simple highly rated solution for 5 pin trailer connections. The 22 inch lead and 18 AWG wires meet standard requirements for most light to medium duty trailers ensuring consistent performance and signal reliability.
Pros
- Very high rating
- Simple and direct design
- Blunt cut wires
- Rubber housing
- Easy splice points
Cons
- Limited product description
- Fewer features
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Blunt cut wires allow for clean splicing into existing harnesses without pre stripped insulation confusion. The heavy duty plug design resists wear and tear while maintaining a secure lock when connected to the vehicle socket.
While highly rated by users specific technical details are less emphasized in descriptions compared to other brands. This simplicity appeals to those looking for a no fuss replacement plug without unnecessary added features.
Best for straightforward replacements where proven reliability is valued over specialized features this harness provides a solid performance backbone for standard utility and boat trailers.
Clean Installation
The blunt cut wires allow for precise splicing ensuring a secure connection when integrating with existing trailer wiring systems.
Proven Reliability
High customer ratings reflect consistent performance and satisfaction with the product quality and ease of installation over time.
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10. Oyviny Vehicle-Side 5 Way Flat Trailer Wiring Harness Female Plug Connector – Female Side Only
Oyviny Vehicle-Side 5 Way Flat Trailer Wiring Harness Female Plug Connector
31 Inch wire loop
Female plug connector
Bonded wire design
Dust cover included
This connector provides a dedicated female plug to connect to the vehicle socket allowing the main male plug to remain inside the trunk or under the frame. The 31 inch wire loop gives ample length for routing without tension at the connection point.
Pros
- Female side for trunk storage
- 31 inch wire loop
- Bonded wires for strength
- SAE compliant colors
- Ergonomic grip tabs
Cons
- Female side only
- Limited application scope
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Bonded wires ensure durability and the color coding follows SAE specifications for easy identification during installation. The dust cover protects the connector from water and dirt when not in use extending its service life.
Since this is a female side only product it is designed to complement an existing trailer male plug or for specific adapter setups. It does not function as a standalone replacement for the trailer end connector.
Ideal for users wanting to protect their vehicle socket or extend reach to a convenient storage location this adapter simplifies the towing setup process and keeps components organized.
Socket Protection
Using a female adapter allows you to store the main connector safely inside the vehicle preventing corrosion or physical damage to the socket.
Compliance Standards
Adhering to SAE J1128 specifications ensures the color coding is universally understood making troubleshooting and repair easier for any technician.
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Buying Guide – How to Choose the Best 5 Way Flat Trailer Wiring Harness Plug
Selecting the right harness involves considering wire length gauge connector type and specific trailer needs to ensure safety and reliability on the road.
Wire Length
The length of the harness determines how easily you can route it from the vehicle hitch to the trailer connection point. Standard lengths like 22 inches work for most setups but vehicles with deep trunks or long frames may need 48 inches or more to avoid tension.
Measure the distance from your vehicle socket to the trailer plug and add a few inches for slack to prevent strain during driving.
Wire Gauge
Wire gauge indicates the thickness of the copper conductors. Common harnesses use 18 AWG which is sufficient for standard lighting but 16 or 14 AWG may be better for long runs or heavier loads to reduce voltage drop.
Thicker wires provide better conductivity and durability so opt for 16 or 14 AWG if your trailer has multiple lights or long wire runs.
Connector Type
Ensure the plug matches your vehicle and trailer socket types. Most trailers use 5 way flat plugs but some require different pin configurations. Mismatched connectors can lead to loose connections and failed lighting.
Verify that the plug has a tight friction fit or locking mechanism to keep it secure during vibrations and turns while driving.
Material Durability
The housing material and terminal finish affect corrosion resistance. Brass terminals with tin plating are ideal for wet conditions. Rubber molded plugs offer better impact resistance than plastic ones.
Choose terminals with corrosion resistant finishes and a robust housing material like rubber if you tow in harsh weather or muddy environments regularly.
Split Wire Design
A split wire design allows wires to branch directly to taillights rather than running across the axle. This simplifies routing and reduces potential failure points from wire damage.
Prioritize harnesses with split wires if your trailer requires individual taillight connections to make installation cleaner and more reliable.
Dust Cover
A rubber dust cover protects the plug from moisture and debris when not connected. This extends the life of the terminal pins and prevents corrosion over time.
Look for models that include a fitted dust cover to ensure the connector remains clean and functional during storage periods.
Ease of Installation
Pre-stripped wires and color coding simplify the installation process significantly. This reduces the time needed to splice into existing wiring and minimizes errors during connection.
Select a harness with pre-stripped ends and clearly marked color codes to make DIY installation quicker and more accurate without tools.
Brand Reputation
Well known brands often provide better quality control and consistent performance. Reading reviews can give insight into real world durability and customer support experiences for specific models.
Consider established brands with positive user feedback to ensure you receive a reliable product that performs consistently over years of use.
How to Use and Care for Your 5 Way Flat Trailer Wiring Harness Plug
Before connecting inspect both the vehicle and trailer plugs for dirt or corrosion. Clean terminals with a wire brush if needed to ensure a solid electrical contact.
Push the plug firmly into the socket until it locks in place. Verify that the dust cover is removed during use to prevent it from catching on debris while driving.
After towing store the plug in a dry place and replace the dust cover to protect the pins from environmental damage and moisture accumulation.
Frequently Asked Questions
What does the 5th pin on a flat trailer plug do?
The 5th pin is typically used for reverse lights allowing the trailer lights to illuminate when the vehicle shifts into reverse. This helps with visibility and safety during reversing maneuvers.
Can I use a 5 way plug on a 4 way trailer?
Yes you can use an adapter to convert a 5 way plug to fit a 4 way socket. However the reverse light function will not be utilized as 4 way systems do not support reverse signals.
How do I know if my wires are correctly color coded?
Standard colors are white for ground, brown for tail lights, yellow for left turn and green for right turn. Blue is often for electric brakes or reverse lights depending on the system configuration.
Why do my trailer lights flicker when braking?
Flickering usually indicates a loose connection or a corroded wire. Check all terminals and ground connections to ensure they are tight and clean before replacing the harness.
Should I use electrical tape on wire connections?
Electrical tape is a temporary solution. Soldering wires or using crimp connectors provides a more reliable and weatherproof connection that lasts longer and performs better during vibration.
How often should I replace my trailer wiring harness?
Inspect your harness annually for signs of wear or corrosion. Replace it immediately if you notice frayed wires or exposed metal to prevent electrical failures or shorts while towing.
What is the difference between vehicle and trailer side connectors?
The vehicle side connector is usually a female socket attached to the car frame. The trailer side connector is a male plug that attaches to the trailer wiring system.
Final Thoughts on Choosing the Best 5 Way Flat Trailer Wiring Harness Plug
This guide has explored ten top options for 5 way flat trailer wiring harnesses ranging from budget picks to premium models. Each harness offers unique features like extra length split wires or better corrosion resistance.
Prioritize a harness that matches your trailer's length requirements and offers robust connectors to ensure long term reliability. Consider factors like wire gauge and ease of installation when making your final decision.
Remember that prices and stock can change so verify current details on the retailer site before purchasing. Investing in a quality harness ensures safe reliable lighting for every trip you take.