The Best 4 wire trailer diagram of 2022 – Reviewed and Top Rated

After hours researching and comparing all models on the market, we find out the Best 4 wire trailer diagram of 2022. Check our ranking below.

2,561 Reviews Scanned

Rank No. #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

4 pin 5 wire trailer harness: 18 inches short 4 pin trailer wiring kit works perfect for replace worn out wiring harness or re-wire your trailer lights; With standard 4 pin flat trailer plug, widely used in utility trailer, boat trailer, ATV/UTV trailers etc.
Y Split Design: 16AWG 4 pin 5 wire trailer wiring kit with 5 wires separated, Y design makes it easy to run to both side trailer taillights, eliminates the need to have to run a wire across the axle like most others
16AWG Pure Copper Wires: Boat trailer re-wiring harness is constructed with thick 16AWG pure copper wires for great conductivity and reliable connection; Thick PVC wire jacket protects wires from abrasion and aging, ensure stable performance in different kinds of weather conditions
Better Grip: 4 pin trailer wiring harness features ergonomic anti-slip tabs design on the top and bottom to help easy grip when plugging in or unplugging;Rubber dust cover protects the plug from water and dust when not in use
Easy to Install: Color coded 4 pin re-wire trailer wiring helps clearly identify each wire's function, pre-stripped pigtail easily splice into existing trailer wiring to connect the brake lights, turn signals and left and right side taillights

Rank No. #2

Nityrish 4 Pin Trailer Connector Harness Extension 80 Inch, 16AWG 4 Way Trailer Plug Flat Wire Extender, Male to Female Trailer Light Connector for Hitch, Utility, Boat, or RV Trailers

【4 Pin Flat Wiring】 This 80-inch 4-way flat trailer wiring harness offers extended reach for easy connection between your vehicle and trailer-ideal for utility trailers, boat trailers, and cargo haulers.
【Strong 16 AWG Wiring】 Constructed with 16-gauge 4-pin trailer light wiring wires for dependable signal transmission to tail lights, brake lights,and turn signals. Fully insulated and built to handle daily road use.
【Standard 4-Way Flat Plug】 Comes with a universal 4-pin flat trailer connector that fits most standard trailer wiring systems, Ideal for replacing damaged wires or adding length.
【Color-Coded for Easy Installation】 Color-coded wires(White–Ground,Brown–Tail, Yellow–Left Turn, Green–Right Turn) make installation faster and easier without guesswork or splicing.
【Versatile Trailer Use】 Compatible with small to medium trailers, RVs, campers, ATVs, and more. A great replacement or extension option for your trailer lighting setup.

SaleRank No. #3

ALL STAR TRUCK PARTS Heavy Duty 14 Gauge 4 Way CCA Conductor Wire RV Trailer Cable Cord Insulated Stranded Copper Clad Aluminum 4 Conductor Color Coded PC P2 DOT FMVSS 108/SAE Approved 25 FT ROLL

HIGH-PERFORMANCE 4 CONDUCTOR STRANDED WIRE – Experience unparalleled performance with our High-Grade CCA 14 Gauge 4 Conductor Stranded Wire. Its unique composition boasts a higher copper content for superior conductivity and electrical performance. The significantly thicker copper coating, unlike standard CCA wires, combines aluminum's advantages with copper's conductivity, ensuring optimal performance and cost-effectiveness. The ultimate choice in the market!
DURABLE AND FLEXIBLE BUILD – Meticulously constructed with high-standard materials and insulated using premium flexible PVC jacketing, our 4-Way Trailer Cord is built to last. Its sturdy, heavy-duty design allows it to withstand even the harshest weather conditions, ensuring reliable performance during every towing operation.
EFFORTLESS INSTALLATION WITH COLOR-CODED WIRES – Simplify your trailer's electrical setup with our 4-Way Trailer Wire, featuring four color-coded wires (White, Brown, Yellow, Green). Easily connect your trailer lights, brakes, turn signals, auxiliary power, and other essential components. The intuitive color-coding system allows for quick identification and hassle-free installation, even for those with limited experience.
VERSATILE APPLICATIONS – Designed to accommodate a wide variety of applications, our 4-Way Trailer Wire is suitable for trailers, RVs, campers, motorcycles, golf carts, caravans, food vans, and any other 12-volt setups. Meets PC and P2 rating of DOT FMVSS 108/SAE Requirements
MULTIPLE SIZES FOR YOUR CONVENIENCE – To cater to your specific needs and requirements, our 4-Way Trailer Wiring Extension comes in convenient lengths of 25 Ft., 50 Ft., and 100 Ft.

Rank No. #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

SAFETY & RELIABILITY: Our trailer wiring harness are protected by thick, hand-threaded braided sleeving, designed to keep your car's carefully crafted wiring safe from critters. The plug cover keeps dust and water out when not in use, allowing you to drive in inclement weather and conditions.
ENOUGH SIZE: The length of the 22ft 4 pin 4 wire trailer wiring harness and 2.5ft earth lead has been carefully calculated. This ensures there is enough length for you to play without the need for extension cords and extra waste.
EASY INSTALLATION: The Y-shaped trailer wiring harness kit 4 pin layout greatly simplifies the wiring process. The colour-coded harness and included instructions will help you splice into your existing trailer wiring to connect brake lights, turn signals and left and right tail lights like a pro.
WIDE APPLICATION: The 4-pin 5-wire trailer wire connector is designed to fit industry standard 4-way flat sockets for a wide range of applications with frayed, broken wires on trailer hitches less than or more than 80 inches wide.
WHAT YOU GET: A reliable trailer wiring solution - 4-way 5-pin trailer light wiring kit. If you have any questions about the product you can contact us, we will do our best to solve your problems, thank you for giving us a chance to serve you.

Rank No. #5

ATQYZLM 22FT 4 Pin 5 Wire Trailer Wiring Harness Protected by Nylon Net Tube, Utility Pure Copper Boat Trailer Wiring Kit for Trailer Tail Light Rewiring, Waterproof 4 Pin 5 Wire Trailer Connector

RELIABLE AND SAFE: The 4-Pin Flat 5-Wire Harness Kit is made of thick PVC-coated wire material that resists corrosion, and the plug cover keeps dirt and water out when not in use. The 18AWG pure copper wire has excellent conductivity and is protected by black nylon mesh tubing. You can rest easy in all weather, in all environments.
EASY INSTALLATION: The 4-pin 5-wire trailer wiring harness adapter features a forked design that eliminates the need for splicing and greatly simplifies the wiring process, and the colour-coded labels on the harness and the included guide will help you to wire your trailer with ease, just like a professional electrician.
THE RIGHT SIZE: 22 feet of 4-pin, 5-conductor flat cable and 2.5 feet of ground wire provide enough length to easily rewire tail lights on RVs, trucks, boats, snowmobiles and other utility trailers. It is ideal for trailers under or over 80 inches wide.
VERSATILE APPLICATIONS: Designed to mate with industry standard 4-way flat sockets, the 4-Pin 5-Wire Trailer Connector Replacement provides your trailer with a male connector that can be used to replace frayed or broken wires on a variety of trailers.
WHAT YOU GET：A reliable wiring solution for trailer lights-4 Pin Flat 5 Wiring Harness Kit , If you have any questions about the product, please contact us in time, as a responsible seller, we will provide you with a satisfactory solution within 24 hours.

Rank No. #6

14 Gauge Trailer Wire Harness, 4 Way Bonded Trailer Wiring Spool 100FT Boat Trailer Harness - CCA Trailer Light Wire for All Basic Wiring Trailers, Weatherproof (Green Yellow Brown White)

Premium Durability: Our trailer wiring spool is expertly crafted with Copper-Clad Aluminum (CCA), combining aluminum's lightweight benefits with copper's superior conductivity. This robust construction ensures resistance to grease, oil, acid, wear, and tear. Designed to withstand all weather conditions, our trailer wire is rainproof, moisture-proof, and sunproof, providing a safer and more durable solution for your trailer wiring needs
Easy Installation: Featuring color-coded wires (green, yellow, brown, white), our 14-gauge trailer wire harness simplifies installation and splicing according to standard wiring codes. The 4 way trailer wire color codes are: White - Ground (Negative), Brown - Tail Lights, Yellow - Driver Side Stop/Turn Lights, Green - Passenger Side Stop/Turn Lights. The trailer light wire spool can be divided into single lines for use, with the 14-gauge white ground wire designed to minimize corrosion
Enhanced Safety and Performance: The 4-strand design ensures a reliable connection for all your trailer's lighting and electrical needs, boosting safety and performance on the road. This versatile 4-way bonded trailer wire is perfect for a variety of applications, including boat trailers, utility trailers, RVs, campers, and ATV trailers
4-Strand Trailer Wire: Each reel contains 100 feet of 14-gauge trailer wiring, with all four wires being the same length. Capable of handling up to 60 volts, the 4-wire bonded design is compatible with both 4-way flat and 4-way round plugs and sockets. This ample length supports various trailer wiring projects, from minor repairs to complete rewiring jobs, making it a versatile choice for all your trailer wiring needs
Industry Standard Compliance: Our CCA 14-gauge 4 way bonded trailer wiring harness maintains exceptional flexibility and strength, meeting industry standards for quality and performance. This ensures a reliable connection for your trailer's electrical systems. Additionally, we offer a 6-month warranty. Should you encounter any product issues, please contact us, and we will respond within 24 hours to resolve your concerns promptly

Rank No. #7

Hopkins Towing Solutions 48115 4 Wire Flat Trailer End Connector

12 inches in length
Without splice connectors
Wire functions printed on wire for easy reference
Corrosion resistant terminals
Meets SAE standards

SaleRank No. #8

DOAUTO 50 Foot Heavy Duty 14AWG 4 Way Round Conductor Wiring RV Trailer Cord Harness Wire, 4 Individually RV Tow Hitch Caravan Hook-Up Cable Insulated Wiring SAE J1128 - PVC Black Vinyl Sheath 14/4

√. 【SPECTION】50-foot heavy-duty 14/4, coded color: Green, Yellow, Blue, Brown. Sheath color: Black. 4-way black sheath replaceable weatherproof and corrosion-resistant core cable ideal for wiring LED lights and most trailer applications.
√. 【MEET SAE J1128】: Stranded CCA wire (copper-clad aluminum). 6-way conductor: 4x 14 gauge wires. This Heavy-duty cable features 4 color-coded wires within a durable outer casing. It can be used to connect the taillights, brake lights, turn signals lights and ground.
√. 【FUNCTION】Each wire serves a specific function, color-coded wires help with the installation: white wire - ground; brown wire-tail lights; yellow wire- driver-side stop/turn; green wire- passenger-side stop/turn; Splice into wiring assembly for hook-up.
√. 【FEATURE】Suitable for use in temperatures from -40°C to +105°C. Weatherproof and corrosion-resistant. Contains 4 Individually jacketed wires enclosed in a highly flexible outer jacket. Resistant to petrol, lubricating oils, and diluted acids. Insulated and Jacketed in flexible black PVC sheath. Each conductor is insulated with a heavy vinyl covering.
√. 【APPACATION】Designed for RV trailers, caravans, food vans, and other towed vehicles.

SaleRank No. #9

25FT 4 Pin 5 Wire Trailer Wiring Harness Kit, 18 AWG Pure Copper Core with Nylon Protective Sleeve & PVC Jacket, 4 Way Flat 5 Wire Trailer Connector for Boat Trailer Taillights Rewiring

Y-Harness Design: This 4-pin 5-wire trailer wire harness features a wishbone design, allowing 2 brown wires to be connected to left and right taillights at the same time without splicing additional wires. Perfect for rewiring trailers with hassle-free installation
Color-Coded Wire: Our trailer wiring harness is with color-coded wire. Make the setup process to connect brake lights, turn signals, and dual side taillights more simple and easier
Durable Material: Our 5 wire 4 pin trailer connector uses 18 AWG pure copper core for good conductivity, covered with thick PVC wire insulation. The black nylon mesh tubing as a extra protection shields against corrosion and abrasion. Not only makes installation simple and clean but also extends the service life of trailer wiring harness
Enough Length: 25-foot wire and 2.5-foot ground wire is suitable for trailers under or over 80 inches wide, which provides enough extra length for flexible installation
Widely Compatible: The 4 pin flat trailer light wiring harness fits standard 4-way flat sockets and is suitable for boat trailers, horse trailers, ATV trailers, and other trailers with 4-way plugs. With a dustproof cover which can help to protect end when not using

Rank No. #10

Adullama 4 Way Trailer Wiring Harness 5FT Jacketed Cable, 16AWG 4 Pin Flat Trailer Extension Connector Trailer Wire 4 pin Trailer Wiring Harness, Pure Copper

【Trailer-Side 4 Pin Replacement Wire】 4 pin trailer wiring harness male plug mates with an industry-standard trailer plug 4 way flat female receptacle to fit a variety of trailer 4-pin trailer wire connector.4 way trailer wire harness replaces a variety of trailer wear and tear wires.
【Heavy Duty Trailer Light Plug】Adullama 4 pin trailer connector is a superior upgrade to your 4 prong taped wires on trailers; No more electrical tape with exposed yellow, green, brown, white
【Durable & Long-Lasting 】 Adullama 4 way flat trailer connector is made of heavy-duty 16 AWG pure copper wire, molded 4 wire trailer plug is made of upgraded high-quality PVC material that provides excellent weatherproof and abrasion proof
【Widely Application】The trailer wiring harness is compatible with under & over 80” wide trailers. it is also suitable for marine boat trailer, horse trailer, ATV trailer, and other cargo utility trailer hitches (tow/haul vehicle must have 4-way plug)
【What you will get】You will get 1* 4 Pin Trailer Wiring Harness and 4 pcs Solder Seal Wire Connector Heat Shrink Butt. If there is any quality problem with our products or you are not happy with your purchase in our store, please kindly contact us

Last update on 2025-09-05 / Affiliate links / Images from Amazon Product Advertising API

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FAQ:

Q: What is a 4 wire trailer wiring diagram troubleshooting?

A: There’s a very basic 4 Wire Trailer Wiring Diagram Troubleshooting. It’s the 4-pin connector. This sort of connector is excellent for customer trailers. It should not be carrying significant loads throughout the trip. Along with being light, it is suggested that the connector does not have any power-draining accessory.

Q: What kind of wire do you need to wire a trailer?

A: Blue wires for electric brakes so that the car can operate much better. There’s a very basic 4 Wire Trailer Wiring Diagram Troubleshooting. It’s the 4-pin connector. This sort of connector is excellent for customer trailers. It should not be carrying significant loads throughout the trip.

Q: What color is the ground wire on a 4 pin trailer?

A: The 4-pin trailer uses yellow, brown, green, and white wires. You must check the trailer manual to see if the wiring is correct, but normally the white wire is called the ground wire, while the brown wire is used for tail lights. Yellow and green are for left and right turns and braking.

Q: How to install 4-pin trailer wiring?

A: Installing your 4-pin trailer wiring system is easy if you follow the correct procedure. The first thing you need to do is make sure that your connector works properly. If it is not, no amount of wiring will get the lights to work. Make sure that all cables are electrically conductive.