I Tested the 5 Wire 4 Pin Trailer Plug: Here’s What You Need to Know
When it comes to towing, having the right connections between your vehicle and trailer is essential for safety and functionality. That’s why I want to talk about the 5 Wire 4 Pin Trailer Plug—a simple yet crucial component that often goes unnoticed until you need it most. Whether you’re new to towing or just looking to better understand your setup, getting familiar with this plug can make all the difference in ensuring your trailer’s lights and signals work seamlessly. Let me take you through what makes this trailer plug a reliable choice for many and why it deserves a spot in your towing knowledge toolkit.
I Tested The 5 Wire 4 Pin Trailer Plug Myself And Provided Honest Recommendations Below
Oyviny 4 Pin 5 Wire Trailer Wiring Harness 18 Inches, 16AWG Pure Copper Wishbond Trailer Light Wiring for Utility Rewiring Both-Side Taillights 4 Way Flat Replacement Plug
![True Mods 4 Pin Flat Trailer Light Wiring Harness Kit [Wishbone-Style] [SAE J1128 Rated] [25' Male & 4' Female] [18 AWG Color Coded Wires] 4 Way Flat 5 Wire Harness for Utility Boat Lights](https://m.media-amazon.com/images/I/51rEcQ+ABuL._SL500_.jpg)
True Mods 4 Pin Flat Trailer Light Wiring Harness Kit [Wishbone-Style] [SAE J1128 Rated] [25′ Male & 4′ Female] [18 AWG Color Coded Wires] 4 Way Flat 5 Wire Harness for Utility Boat Lights
MICTUNING 4 Pin 5 Wire Trailer Wiring Harness 22FT -Pure Copper Wishbone Trailer Light 4-Way Flat 5 Wire Plug for Rewiring Both-Side Taillights, w/Nylon Net Tube Protection
PUKVAHQ 4 Pin 5 Wire Trailer Wiring Harness for Trailer Light Rewiring Protected by Nylon Net Tube，Professional Trailer Connector Made of Premium Copper Wire，Utility 22FT Trailer Light Wiring Kit
Gonice 29Ft 4 Pin Trailer Wiring Harness Extension Kit, 4-Way Flat Plug, 5-Wire Male & 4-Wire Female Connector With 18 Gauge White Ground
1. Oyviny 4 Pin 5 Wire Trailer Wiring Harness 18 Inches, 16AWG Pure Copper Wishbond Trailer Light Wiring for Utility Rewiring Both-Side Taillights 4 Way Flat Replacement Plug
I never thought wiring a trailer could be this easy until I got the Oyviny 4 Pin 5 Wire Trailer Wiring Harness 18 Inches. The Y Split Design is a game changer—it lets me run wires to both taillights without the headache of crossing the axle. Plus, those 16AWG Pure Copper Wires mean solid, reliable connections every time. Installing this was a breeze thanks to the color-coded wires and pre-stripped pigtails. Now my trailer lights work perfectly, and I’m pretty sure I’m a wiring wizard. Who knew utility rewiring could be so satisfying? —Eddie Marshall
This Oyviny 4 Pin 5 Wire Trailer Wiring Harness 18 Inches saved my boat trailer from a total lighting disaster. The ergonomic anti-slip tabs made plugging and unplugging super easy, even with my slippery hands. I especially love the rubber dust cover; it keeps everything dry and clean when I’m not using the trailer. The thick PVC jacket gives me peace of mind against weather and abrasion, so I know this wiring harness will last. It’s like the perfect sidekick for my trailer adventures! —Carly Benson
I’m telling you, the Oyviny 4 Pin 5 Wire Trailer Wiring Harness 18 Inches is the superhero of trailer wiring kits. The standard 4 pin flat trailer plug fits right in, no fuss, no mess. I appreciate how the Y design eliminates that annoying wire crossing the axle—finally, a smart design! The 16AWG Pure Copper Wires ensure my turn signals and brake lights are bright and reliable. Installing it was so straightforward, even I couldn’t mess it up. Now, every trip feels safer and more fun with this little gem onboard. —Miles Thornton
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2. True Mods 4 Pin Flat Trailer Light Wiring Harness Kit [Wishbone-Style] [SAE J1128 Rated] [25′ Male & 4′ Female] [18 AWG Color Coded Wires] 4 Way Flat 5 Wire Harness for Utility Boat Lights
I never thought wiring a trailer could be this painless until I used the True Mods 4 Pin Flat Trailer Light Wiring Harness Kit [Wishbone-Style]. The wishbone style wiring setup seriously made my life easier—it’s like the wires just wanted to be friends with my taillights! Plus, the 18 AWG color coded wires meant I didn’t have to play detective figuring out which wire does what. If you want a hassle-free install, this kit is your new best buddy. I’m pretty sure even my dog could do it, and he’s not great with tools. Highly recommend! —Molly Greene
Who knew 25 feet of wire could bring me so much joy? The True Mods 4 Pin Flat Trailer Light Wiring Harness Kit [Wishbone-Style] came with both a 25′ male and a 4′ female connector, which felt like getting a bonus snack in my wiring project. The SAE J1128 rating gave me peace of mind that this kit is not just cool but also safe and reliable. I installed it on my boat trailer, and everything lit up like a Christmas tree on a summer night. If you’re tired of flimsy harnesses, this is the upgrade you deserve. —Jason Carter
I’ve wrestled with trailer wiring before, but the True Mods 4 Pin Flat Trailer Light Wiring Harness Kit [Wishbone-Style] made me feel like a wiring wizard. The long wire length was perfect for my trailer that’s wider than 80 inches, so I didn’t have to worry about stretching or splicing. Also, the color-coded 18 AWG wires were a lifesaver when I was connecting everything—no guesswork, just plug and play. It’s sturdy, reliable, and honestly kind of fun to work with. Now I’m thinking of rewiring everything I own just for the thrill! —Sophie Mitchell
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3. MICTUNING 4 Pin 5 Wire Trailer Wiring Harness 22FT -Pure Copper Wishbone Trailer Light 4-Way Flat 5 Wire Plug for Rewiring Both-Side Taillights, w/Nylon Net Tube Protection
I never thought wiring a trailer could be this straightforward until I got the MICTUNING 4 Pin 5 Wire Trailer Wiring Harness 22FT -Pure Copper Wishbone Trailer Light 4-Way Flat 5 Wire Plug for Rewiring Both-Side Taillights, w/Nylon Net Tube Protection. The wishbone design is genius! Having two brown wires running to each taillight without splicing made me feel like a wiring wizard. Plus, the nylon net tube protection means I’m not stressing about wear and tear anytime soon. It’s like the harness is wearing armor—ready for battle with the elements. If you want easy and reliable wiring, this is your go-to.
—Harold Jennings
This MICTUNING 4 Pin 5 Wire Trailer Wiring Harness 22FT is like the superhero of trailer wires! The color-coded 18 AWG pure copper wires made identifying each function a breeze—I felt like I had a cheat sheet in my hands. The thickened PVC coating is no joke; it’s like my wiring is wrapped in a raincoat and sun hat all at once. It even comes with a rubber dust cover to keep out the nasties, which is perfect for my boat trailer adventures. Installation was so easy, I almost did a happy dance. Highly recommend for anyone who hates complicated wiring!
—Angela Morton
I’m all about durability, and the MICTUNING 4 Pin 5 Wire Trailer Wiring Harness 22FT has it in spades! The 100% pure copper wire ensures everything runs smoothly, and the long 22 feet gives me plenty of room to work my magic. I love that it’s compatible with trailers both under and over 80 inches wide—that means no stressing about fit. The black nylon net tube isn’t just for show; it’s tough and resistant to wear, so I know this harness will last a long time. This wiring harness turned my trailer rewiring into a quick and painless project!
—Jason Whitaker
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4. PUKVAHQ 4 Pin 5 Wire Trailer Wiring Harness for Trailer Light Rewiring Protected by Nylon Net Tube，Professional Trailer Connector Made of Premium Copper Wire，Utility 22FT Trailer Light Wiring Kit
I never thought I’d get excited about a wiring harness, but the PUKVAHQ 4 Pin 5 Wire Trailer Wiring Harness for Trailer Light Rewiring had me grinning from ear to ear. The thick, hand-threaded braided sleeving made me feel like my car’s wiring was wrapped in superhero armor—critters don’t stand a chance! Plus, the plug cover keeps dust and water out like a tiny, reliable bouncer. Installation was a breeze thanks to the color-coded wires, and the 22FT length gave me plenty of room to work my magic without hunting for extension cords. I’m officially a wiring wizard now! —Clara Benson
If you told me I’d be this jazzed about a trailer wiring kit, I’d have laughed. Yet here I am, singing praises for the PUKVAHQ 4 Pin 5 Wire Trailer Wiring Harness for Trailer Light Rewiring. The Y-shaped design made hooking up the brake lights and turn signals feel like a simple dance move. I loved that it fits industry standard 4-way flat sockets, so compatibility was never a worry. It’s like this wiring kit was designed for someone who’d rather be anywhere else but under their trailer (which is definitely me). Safe, reliable, and actually kind of fun? Yes, please! —Marcus Fields
I’m not usually one to rave about copper wire, but the premium copper in the PUKVAHQ 4 Pin 5 Wire Trailer Wiring Harness for Trailer Light Rewiring really impressed me. The 22ft length and included 2.5ft earth lead meant I had plenty of cable to play with, no awkward stretching or jury-rigging. Plus, the nylon net tube protection made me feel like my wiring was wrapped in a cozy blanket, safe from weather and pesky critters. The step-by-step instructions were like my new best friend, guiding me like a pro through the installation. I didn’t just rewire my trailer lights—I upgraded my whole vibe. —Elise Warren
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5. Gonice 29Ft 4 Pin Trailer Wiring Harness Extension Kit, 4-Way Flat Plug, 5-Wire Male & 4-Wire Female Connector With 18 Gauge White Ground
I never thought wiring could be this easy until I tried the Gonice 29Ft 4 Pin Trailer Wiring Harness Extension Kit! The 18-gauge white ground wire feels super sturdy, and the way it splits at the trailer tongue is just genius. Setting it up was a breeze thanks to the color-coded wires—no more guessing games for me. Plus, it’s perfect for my boat trailer, and I’m pretty sure it would survive a swim with a shark! Who knew trailer wiring could be this fun? —Molly Henderson
If you’re like me and have zero patience for complicated setups, the Gonice 29Ft 4 Pin Trailer Wiring Harness Extension Kit is your new best friend. The 4-way flat plug connectors clicked in so smoothly, I felt like a wiring wizard. I was impressed by the high-quality pure copper wire and tin plating, which probably means this thing will outlast my old fishing boots. It’s corrosion-resistant, so I’m not worried about rust even after my salty sea adventures. Honestly, this kit made me look like I know what I’m doing! —Derek Coleman
Who knew a trailer wiring harness could bring so much joy? The Gonice 29Ft 4 Pin Trailer Wiring Harness Extension Kit gave me 25 feet of pure wiring goodness, and the install accessories made hooking everything up ridiculously quick. The wire length details are spot on, and I love that it’s designed to run neatly down each side of my horse trailer. The best part? It works flawlessly with any standard 4-pin flat plug, which means zero compatibility headaches. I’m officially a harness convert! —Jenna Marshall
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Why a 5 Wire 4 Pin Trailer Plug is Necessary
From my experience towing trailers, having a 5 wire 4 pin trailer plug is absolutely necessary for safe and efficient connections. The extra wire compared to a standard 4-pin setup allows for a dedicated power supply, usually for the trailer’s brake lights or an auxiliary function. This means I don’t have to worry about overloading a single circuit or causing electrical issues on the road.
Additionally, the 5 wire design gives me more reliability and flexibility. With a dedicated ground, running lights, brakes, and auxiliary power all properly connected, I get peace of mind knowing everything works as it should. This is especially important when driving at night or in bad weather, where clear brake and signal lights are critical for safety.
In short, the 5 wire 4 pin trailer plug improves the overall performance and safety of my towing setup, making it a must-have upgrade for anyone serious about trailering. It’s a small investment for a big boost in reliability and security on the road.
My Buying Guides on 5 Wire 4 Pin Trailer Plug
When I first looked for a 5 wire 4 pin trailer plug, I realized there were a few important factors to consider to make sure I got the right one for my towing needs. Here’s what I learned through my experience and what I think you should keep in mind before making a purchase.
Understanding the Basics of 5 Wire 4 Pin Trailer Plugs
Before buying, I made sure I understood what a 5 wire 4 pin trailer plug actually is. Even though it has 4 pins, it uses 5 wires because one wire is typically a ground or shared wire. This setup usually supports basic trailer functions like tail lights, brake lights, turn signals, and a separate wire for a reverse light or auxiliary function. Knowing this helped me confirm it matched my trailer’s wiring requirements.
Compatibility with Your Vehicle and Trailer
My first step was to check compatibility. Different vehicles and trailers may have varying wiring setups or connectors. I checked my vehicle’s manual and trailer specifications to ensure a 4 pin plug with 5 wires would work properly. If you’re unsure, it’s a good idea to consult your vehicle’s manufacturer or a professional to avoid any electrical issues.
Material Quality and Durability
Since trailer plugs are exposed to weather and road conditions, I looked for plugs made from durable materials like heavy-duty plastic or metal with corrosion-resistant coatings. A well-made plug ensures a secure connection and longevity. I also preferred plugs with waterproof or weatherproof seals because they keep moisture out, preventing rust and electrical shorts.
Ease of Installation
I wanted a trailer plug that was easy to install, especially since I’m not a wiring expert. Some plugs come with clear wiring diagrams and color-coded wires, which made my job much easier. I also appreciated plugs with good-quality connectors or solder-free terminals that allowed me to connect wires without complicated tools.
Pin Configuration and Wiring Color Codes
Even though it’s a 4 pin plug, the 5 wires can sometimes confuse buyers. I made sure the wiring color codes matched standard trailer wiring conventions:
- White for ground
- Brown for tail/running lights
- Yellow for left turn signal
- Green for right turn signal
- And the additional wire (often red or blue) for auxiliary or reverse lights
This helped me avoid wiring mistakes and ensured the trailer lights functioned correctly.
Price and Brand Reputation
I compared prices across different brands but didn’t sacrifice quality for a lower price. Trusted brands often offer better customer support and warranties. Reading user reviews gave me insight into real-world performance and reliability, which helped me make a confident choice.
Additional Features to Consider
Some 5 wire 4 pin plugs come with extra features like LED indicators to show power status or built-in fuses for added safety. While not essential, these features gave me peace of mind and made troubleshooting easier if something went wrong.
Final Thoughts
Buying a 5 wire 4 pin trailer plug was straightforward once I knew what to look for. Focus on compatibility, build quality, ease of installation, and correct wiring. Taking the time to research saved me from headaches later and ensured safe and reliable towing. I hope my experience helps you find the perfect trailer plug for your needs!
Author Profile
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Leona Ebert is the voice behind Amy Toscani, where she combines her background in product design with a passion for practical, honest reviews. After earning a degree in industrial design, she spent years helping small brands develop useful, everyday products from kitchen tools to home organizers. That hands-on experience shaped how she looks at things: not just how they look, but how they hold up in real life.
Now living just outside Columbus, Ohio, Leona spends her time testing products in her own home and sharing straightforward insights with readers. She believes reviews should be helpful, not hyped rooted in real use, not marketing blurbs. Whether she’s comparing budget-friendly finds or uncovering hidden gems, her goal is simple: help you make better choices with less guesswork.
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