5 Way Flat Trailer Wiring Harness Plug 22 inch
4.6Editor score
18 AWG wire gauge
Tinned terminals
Universal fit
In this guide
Choosing the right 5 Way Flat Trailer Wiring Harness Plug is essential for safe towing and reliable lighting. A quality harness ensures your trailer lights function correctly, keeping you compliant with traffic laws and visible to other drivers on the road at all times.
We have carefully evaluated ten top-rated harness plugs based on durability, wire gauge, and installation ease. Our comparison considers real-world performance factors like corrosion resistance and connector grip to help you find a solution that lasts through various weather conditions and towing demands.
Each pick highlights specific strengths such as wire length or material quality to suit different needs. Please note that prices and availability can change frequently, so verify the current details on the product page before making your final purchasing decision for your setup.
Top 3 Picks for Best 5 Way Flat Trailer Wiring Harness Plug
Oyviny 5 Way Flat Trailer Wiring Harness Plug
4.6Editor score
22 inch wire lead
Corrosion resistant brass
Split wire design
CURT 58550 Vehicle-Side and Trailer-Side
4.7Editor score
72 inch wire lead
Molded rubber housing
Color coded wires
Top 10 Best 5 Way Flat Trailer Wiring Harness Plug in 2026 Compared
The following table provides a side-by-side comparison of all ten products analyzed in this guide. Review the key specifications and features to quickly identify which harness plug meets your specific wiring and towing requirements.
ProductsSpecificationsEditor scorePrice
Editor's Choice
Oyviny 5 Way Flat Trailer Wiring Harness Plug
22 inch lead
18 AWG wire
Brass terminals
Split wire design
4.6Editor score
Editor's Choice
RED WOLF 5-Way Flat Trailer Wire Harness
22 inch male
31 inch female
18 AWG cable
Heavy duty bond
4.7Editor score
Best Premium
Oyviny 5 Way Flat Trailer Wire Extension
48 inch loop
18 gauge wire
Rubber molded
Universal socket
4.7Editor score
5 Pin Trailer Connector 14AWG Pure Copper Wire
25 inch length
14 AWG wire
Pure copper
PVC insulation
4.2Editor score
Oyviny 4 Pin 5 Wire Trailer Wiring Harness
18 inch short
16 AWG wire
Y split design
Anti-slip tabs
4.9Editor score
5 Way Flat Trailer Wiring Harness Plug 22 inch
22 inch size
18 AWG gauge
Brass material
Grounding included
4.6Editor score
5 Way Trailer Connector Wire 40 inch Jacketed Cable
40 inch tail
18 AWG gauge
Black sheathing
Clip sides
4.3Editor score
CURT 58550 Vehicle-Side and Trailer-Side
72 inch wires
16 gauge wire
Molded rubber
Ergonomic design
4.7Editor score
Nilight 5 Way Flat Trailer Wiring Harness Plug
22 inch wire
18 gauge wire
Pure copper
Abrasion proof
4.9Editor score
Oyviny Vehicle-Side 5 Way Flat Trailer Wiring Harness
31 inch lead
5-pin female
Brass terminals
Pre-Stripped
4.7Editor score
1. Oyviny 5 Way Flat Trailer Wiring Harness Plug – Best Overall
Oyviny 5 Way Flat Trailer Wiring Harness Plug
22 inch wire lead
18 AWG gauge
Brass terminals
Split wire design
This Oyviny harness stands out as a top choice for its balance of durability and functionality. It holds a strong rating from users who appreciate the reliable connection it provides for various trailer types.
Pros
- Corrosion resistant materials
- Quick installation ready
- Split wire convenience
- Ergonomic grip tabs
- Waterproof dust cover
Cons
- Standard wire length
- No female adapter
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The split wire design eliminates the need for jumpers, allowing direct connection to taillights. This simplifies wiring runs and reduces potential points of failure in your electrical system.
While it performs well, the 22 inch length might require extensions for larger vehicles. However, the split wire quality and terminal plating ensure long term performance despite minor size limitations.
Ideal for most boat and utility trailers, this harness is a dependable upgrade. It is the best fit for those seeking a plug and play solution with minimal hassle during installation.
Enhanced Connectivity
The split wire feature ensures each light gets dedicated power, improving reliability and reducing electrical load issues.
Durable Materials
Brass terminals and tin plating resist rust, ensuring the connection remains secure even in wet or salty conditions.
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2. RED WOLF 5-Way Flat Trailer Wire Harness – Complete Kit
RED WOLF 5-Way Flat Trailer Wire Harness
Male female pair
22 31 inch
18 AWG cable
Heavy duty bond
RED WOLF provides a comprehensive kit with both male and female connectors. This flexibility makes it easier to integrate into existing vehicle setups without additional adapters.
Pros
- Includes male and female
- Extended female length
- Strong wire bond
- Wide vehicle compatibility
- Easy splicing design
Cons
- Higher price point
- Female length varies
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The female connector offers a longer 31 inch reach, which helps in routing wires from the trunk or rear of larger vans. The heavy duty bonded loop wire is robust for splicing.
Some users might find the length difference between male and female confusing initially. However, the extra reach on the female end is often a significant benefit for hidden connector placements.
This kit is excellent for full re-wire jobs or adding utility trailers. It suits those who need a complete solution with extra length for flexible vehicle integration and reliable connections.
Versatile Pairing
Having both ends included simplifies complex installations where both vehicle and trailer sides need upgrades.
Robust Wiring
The bonded wire construction prevents internal breaks, ensuring signals transmit correctly even over rough terrain.
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3. Oyviny 5 Way Flat Trailer Wire Extension – Long Reach
Oyviny 5 Way Flat Trailer Wire Extension
48 inch loop
18 gauge wire
Rubber molded
Universal socket
This extension harness offers a generous 48 inch loop, perfect for vehicles where the socket is tucked away. It comes with both male and female ends for versatile use.
Pros
- Extra 48 inch length
- Male and female ends
- Rubber waterproof seal
- Universal fit design
- Easy cut splice
Cons
- More wire to manage
- Slightly heavier
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The rubber-molded connector ensures a waterproof seal that protects against moisture and road grime. Pure copper wires with tin-plated brass terminals provide excellent conductivity.
Managing a longer wire requires careful routing to avoid snagging during towing. Yet, the flexibility it offers during installation outweighs this minor inconvenience for many users.
Recommended for setups needing significant wire reach, this harness provides a durable solution. It is ideal for replacing old wiring or extending connections on larger RVs and trucks.
Weather Protection
The molded rubber housing keeps internal components dry, extending the lifespan of the connector in harsh environments.
Flexible Routing
With 48 inches of wire, you have ample slack to route safely without tension on the connection points.
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4. 5 Pin Trailer Connector 14AWG Pure Copper Wire – Heavy Gauge
5 Pin Trailer Connector 14AWG Pure Copper Wire
25 inch length
14 AWG wire
Pure copper core
PVC insulation
This connector uses a thick 14 AWG wire, which offers superior durability and current capacity compared to standard 18 AWG options. Pure copper ensures consistent power delivery.
Pros
- Thick 14 AWG wire
- Pure copper conductivity
- Split wire utility
- Clear color coding
- Included dust cover
Cons
- Lower user rating
- Slightly pricier
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The split wire design allows direct taillight connection, reducing the need for complex harness routing. Color-coded wires simplify identification during the wiring process.
User ratings are lower than top picks, suggesting potential inconsistencies in assembly or materials. However, the heavy gauge wire is a strong advantage for high demand electrical setups.
Best for those prioritizing wire thickness over brand popularity, this connector serves well. It is a solid choice for ATV or utility trailers needing robust wiring capabilities.
Superior Conduction
The 14 AWG pure copper core minimizes resistance, ensuring lights function brightly even over longer distances.
Sturdy Build
Thick PVC insulation protects against abrasion and weather, keeping the internal wires safe from damage.
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5. Oyviny 4 Pin 5 Wire Trailer Wiring Harness – Compact
Oyviny 4 Pin 5 Wire Trailer Wiring Harness
18 inch short
16 AWG wire
Y split design
Anti-slip tabs
Despite being a 4 pin plug, this harness has a remarkably high rating from users. The Y split design is a key feature that simplifies running wires to both sides of the trailer.
Pros
- High user rating
- Y split convenience
- Ergonomic grip tabs
- Pure copper wires
- Rubber dust cover
Cons
- Short wire length
- 4 Pin configuration
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The 16 AWG pure copper wires are robust for a kit of this size. Anti-slip tabs on the plug make it easy to handle when connecting or disconnecting your trailer frequently.
Its short 18 inch length limits it to basic replacement jobs or small utility trailers. Larger setups might need an extension to reach the vehicle socket comfortably.
Highly rated for its quality and ease of use, this harness is great for small rigs. Choose it if you need a reliable compact replacement with good conductivity and grip.
Split Simplicity
The Y split removes the need to run wires across the axle, making rewiring straightforward and efficient.
Secure Grip
Anti-slip tabs ensure you can easily plug and unplug even with gloves on or in tight spaces.
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6. 5 Way Flat Trailer Wiring Harness Plug 22 inch – Best Budget
5 Way Flat Trailer Wiring Harness Plug 22 inch
22 inch size
18 AWG gauge
Brass material
Grounding included
This harness offers a cost-effective solution for basic trailer wiring needs. It delivers reliable performance with standard specs that match most vehicle and trailer sockets effectively.
Pros
- Affordable pricing
- Standard length
- Corrosion resistant
- Color coded wires
- Wide application
Cons
- Basic plastic housing
- No split wires
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The 22 inch lead is sufficient for most direct connections. Brass terminals resist corrosion to ensure the connection remains solid during regular towing seasons and varying weather conditions.
While it lacks split wires or heavy gauge build, it gets the job done for standard loads. It is a practical pick for those on a strict budget who still need a functioning harness.
Ideal for small utility trailers or simple boat hooks, this plug saves money without sacrificing safety. Choose this for a no-fuss, reliable replacement that keeps your lights working.
Cost Effective
Priced lower than many competitors, it provides essential features without unnecessary extras for basic towing needs.
Reliable Materials
Corrosion resistant brass terminals ensure longevity even if the harness is exposed to moisture or salt regularly.
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7. 5 Way Trailer Connector Wire 40 inch Jacketed Cable – Extended
5 Way Trailer Connector Wire 40 inch Jacketed Cable
40 inch tail
18 AWG gauge
Black sheathing
Clip sides
This harness provides a 40 inch length, which is longer than the standard 22 inch options found elsewhere. The black sheathing covers the wires for a cleaner and more protected look.
Pros
- 40 inch length
- Black sheathing
- Clip grip tabs
- Easy installation
- Marine suitable
Cons
- Sheathing may chip
- Average rating
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Clips on both sides of the plug offer a better grip for connecting and disconnecting. It is suitable for marine trailers and other cargo utility trailers needing extra wire length.
Some users note that the sheathing might wear over time if not handled carefully. However, the extra length is often worth the trade-off for setups where space is limited.
Recommended for those needing more reach than typical harnesses provide, it is a practical option. It works well for trailers where the socket is positioned far from the main wiring point.
Extra Reach
The 40 inch cable allows you to route wires through tight spaces or longer vehicle rear ends easily.
Protected Wires
Black sheathing hides individual wires and protects them from minor abrasions during towing or storage.
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8. CURT 58550 Vehicle-Side and Trailer-Side – Premium Build
CURT 58550 Vehicle-Side and Trailer-Side
72 inch wires
16 gauge wire
Molded rubber
Ergonomic design
CURT is known for quality, and this harness delivers with a 72 inch wire lead. It is designed for both vehicle and trailer sides, making it versatile for complete wiring needs.
Pros
- Long 72 inch lead
- High quality rubber
- Ergonomic grip tabs
- Industry standard match
- Durable construction
Cons
- Long wire management
- Premium price
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The durable black molded rubber housing resists rust and corrosion effectively. Ergonomic grip tabs on the sides make handling the plug easier during routine towing operations.
The long wire length requires careful coiling to avoid tangling when not in use. Despite this, the flexibility and build quality justify the premium cost for serious towing applications.
Best for large RVs or frequent trolers, this harness offers top-tier reliability. Invest in this if you need a heavy-duty solution that withstands daily wear and harsh conditions.
Superior Grip
Ergonomic tabs ensure you can handle the plug confidently, even in adverse weather conditions during hookup.
Flexible Length
With 72 inches, you have massive flexibility to route wires without stress, perfect for custom setups.
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9. Nilight 5 Way Flat Trailer Wiring Harness Plug – Reliable Standard
Nilight 5 Way Flat Trailer Wiring Harness Plug
22 inch wire
18 gauge wire
Pure copper
Abrasion proof
This Nilight harness has a very high user rating indicating strong satisfaction with its performance. It uses pure copper terminals and an abrasion proof cable sheath for durability.
Pros
- Very high rating
- Abrasion proof sheath
- Pure copper terminals
- Heat resistant
- Color coded wires
Cons
- Standard length
- Basic design
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Rated for 300V and 105C heat resistance, it handles electrical demands well. The blunt-cut, color-coded wires make splicing into existing wiring straightforward and accurate.
While it does not offer unique features like split wires, it is a solid standard replacement. The high rating suggests consistent quality control across production batches.
Ideal for standard boat or cargo trailers, this plug is a safe choice. Opt for it if you want a proven reliable connector with good resistance to weather and wear.
High Resistance
Heat and abrasion resistance ensure the harness survives harsh towing conditions without degrading quickly.
User Satisfaction
The high rating reflects consistent performance, making it a trusted option for regular towing needs.
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10. Oyviny Vehicle-Side 5 Way Flat Trailer Wiring Harness – Female Adapter
Oyviny Vehicle-Side 5 Way Flat Trailer Wiring Harness
31 inch lead
5-pin female
Brass terminals
Pre-Stripped
This harness is a female plug designed to splice into trailer wiring for vehicle socket connection. It is particularly useful for extending the connection point from your vehicle's rear.
Pros
- Female plug design
- 31 inch lead
- Rubber dust cover
- SAE compliant
- Ergonomic design
Cons
- Female only
- Short lead for large
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The 31 inch lead offers a good amount of extra length compared to standard adapters. Rubber dust cover keeps the female socket clean and protected from environmental damage.
It complies with SAE J1128 specifications ensuring standard wire color and gauge matching. This makes splicing straightforward without needing to decode wires manually.
Best for vehicle-side installations, this adapter simplifies connecting trailers with standard male plugs. Choose this if your vehicle socket is hidden and you need a reliable extension adapter.
Vehicle Fit
Designed for vehicle-side sockets, this adapter helps integrate external wiring without modifying the factory harness excessively.
Protected Connection
The rubber cover shields the female contacts from dust and moisture, preventing short circuits when unplugged.
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Buying Guide – How to Choose the Best 5 Way Flat Trailer Wiring Harness Plug
Selecting the right wiring harness requires attention to wire gauge length and connector type. This guide breaks down the essential factors to help you match a harness to your specific trailer and vehicle needs.
Wire Gauge and Thickness
Wire gauge determines how much current the harness can carry safely. Lower numbers like 14 AWG indicate thicker wires that resist heat and voltage drop better than 18 AWG wires. For heavy trailers with many lights or electric brakes, a thicker gauge ensures reliable power delivery without overheating.
Always check the gauge before buying to ensure it meets your trailer's electrical demands.
Connector Length
The length of the wire lead affects installation flexibility. A 22 inch lead is standard for many applications but might be short for vans or SUVs where the socket is tucked away. Longer options like 48 or 72 inches provide extra slack for routing wires without tension.
Measure the distance from your vehicle socket to your wiring point to choose the right length.
Material and Durability
Connectors made from brass with tin plating resist corrosion better than plastic or cheap metal. Pure copper wires conduct electricity more efficiently than aluminum or copper-clad alternatives. Rubber-molded housings protect the connector from water and dust compared to bare plastic shells.
Prioritize brass terminals and rubber housings for long-term reliability in all weather conditions.
Split vs. Bonded Wires
Split wire harnesses allow you to run individual wires directly to each taillight. This eliminates the need for jumper wires across the trailer axle, simplifying your wiring. Bonded wires come together which is fine if you only need one common ground or use a junction box.
Choose split wires if you want a cleaner install without extra jumper components.
Gender and Compatibility
Most trailer ends are male plugs but vehicle sockets vary. Ensure your harness matches the connector on your vehicle and trailer. Some kits include both male and female ends for versatility while others are specific to vehicle-side or trailer-side use.
Check the gender of the connectors to avoid compatibility issues during installation.
Ergonomics and Grip
Some harnesses include tabs on the sides of the plug for easier gripping. This is helpful when connecting trailers in tight or dimly lit spaces. A good grip design prevents you from slipping while trying to plug in the connector firmly.
Look for anti-slip tabs if you plan to connect and disconnect frequently.
Color Coding
Standard color coding helps identify which wire controls which light function. Common colors include yellow for left turn, green for right turn, brown for tail lights, and white for ground. Clear color coding simplifies splicing and troubleshooting if a light fails later.
Verify the wire colors match industry standards to ensure correct installation.
Price and Value
Prices vary based on brand and build quality. Cheaper harnesses might work for light use but can fail sooner due to poor materials. Investing in a slightly higher-priced option with better terminals and wires can save money on replacements in the long run.
Balance your budget with the frequency of use and expected durability needs.
How to Use and Care for Your 5 Way Flat Trailer Wiring Harness Plug
Before using, inspect the harness for any visible damage or fraying wires. Ensure the plug is clean and free of debris to maintain a solid electrical connection. Use electrical tape or heat shrink tubing on any exposed splices to prevent short circuits.
When connecting the trailer, push the plug firmly into the socket until it locks or clicks. Avoid twisting the plug excessively as this might damage internal wires over time. Always engage the safety latch if available to keep the connection secure while driving.
To care for the harness, disconnect the plug after each use and store it in a dry place. Periodically check the rubber dust cover to ensure it is intact and covers the contacts when not in use. Clean contacts with a mild electrical cleaner if corrosion signs appear.
Frequently Asked Questions
What does a 5 way flat trailer wiring harness do?
A 5 way flat trailer wiring harness provides the electrical connection between your vehicle and trailer. It controls functions like tail lights, brake lights, turn signals, reverse lights, and grounding. This ensures your trailer lights mirror your vehicle's signals for safety on the road.
Are 5 way flat plugs universal?
Most 5 way flat plugs follow industry standards so they fit many vehicles and trailers. However, pin configurations can vary slightly so always check compatibility. Some brands use different wire layouts or colors so verify the wiring diagram before connecting.
How do I know if I need a male or female connector?
The trailer end typically uses a male plug while the vehicle end has a female socket. If you are replacing a trailer plug you likely need a male. For vehicle extensions, check the existing socket type to determine the right gender.
Can I use a 5 way harness on a 4 way trailer?
You can adapt a 5 way harness for a 4 way trailer by leaving the reverse light pin unused. Connect the remaining pins for ground, tail, brake, and turn signals. This ensures your lights work even if your trailer lacks reverse lights.
How long should the wiring harness be?
Standard lengths are around 22 inches but this might be short for larger vehicles. Choose a longer harness like 48 or 72 inches if your socket is far from the wiring point. Measure carefully to ensure you have enough slack for a clean install.
Why are my trailer lights not working after installation?
Common causes include poor ground connections or incorrect wiring color matching. Check that the ground wire is securely attached to the trailer frame. Test each wire with a multimeter to confirm power flow and ensure the plug is fully seated.
Do I need a special tool to install a harness?
Most harnesses come pre-stripped and only require a wire stripper and crimpers. You may also need heat shrink tubing to insulate splices. No special tools are needed if you are comfortable with basic wiring tasks.
How often should I replace my trailer wiring harness?
Inspect your harness annually for cracks corrosion or wire damage. Replace it if you see fraying or if lights flicker despite good connections. Heavy towing or harsh weather may shorten its life so be proactive with replacements.
Final Thoughts on Choosing the Best 5 Way Flat Trailer Wiring Harness Plug
This guide reviewed ten high-quality harnesses including top picks like the Oyviny 5 Way Flat, RED WOLF kit, and CURT 58550. Each offers unique benefits such as extra length or split wires for different installation needs.
Prioritize wire gauge and connector material to ensure safety and durability. A robust harness prevents electrical failures and keeps your trailer lights functioning reliably under various conditions.
Always verify the current price and availability on the product page before purchasing. Prices change frequently so checking live details ensures you get the best deal for your specific wiring setup.