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The Best Boat Trailer Wiring Harness of 2023 – Reviewed and Top Rated

2,240 Reviews Scanned

Rank No. #1
Miady 25ft Trailer Wiring Harness with 4 Flat Connector, 18 AWG Color Coded Wires Trailer Light Wiring Harness Extension with 4ft White Ground Wire
  • Long Enough: The Miady 25' Trailer Wiring Harness gives you the extra length, just need to extend current truck to trailer wires. No need to splice your new wires, simply extend them with this extender.
  • Wishbone Style Wiring Setup Designed: Constructed with Wishbone Style Wiring Setup and 4 way connectors design makes the running light circuit and splits it at the trailer connector, so you do not have to run a jumper wire from one taillight to the other. Simplify the installation process to save more time.
  • 4FT LENGHT GROUND WIRE: Equipped with 4 Way flat plug connector with trailer ends and a white ground wire, designed to split at the trailer tongue and run down each side of the trailer. The trailer side ground wire is 4ft, it is enough to use for your trailer, which is completely sealed for a long corrosion-resistant installation.
  • SIMPLIFIED CONNECTION: Come with 18 AWG COLOR CODED WIRES clearly identify each wire's function, makes it much easier for wires connection as well as adding more convenience and installation safe and straight-forward.
  • Wide Application: Ideal for marine boat trailer, horse trailer, motorcycle trailer, ATV trailer, and other cargo utility trailer hitches (tow/haul vehicle must have 4-way plug) . - We provide 24*7 friendly customer support and also back our products for 18 months. Please feel free to contact us.
Rank No. #2
Trailer Wiring 50ft Trailer Wire, Serlainxin Trailer Wiring Harness Kit, Trailer Wiring Kit, Trailer Wire Harness, Trailer Wire Kit, Boat Trailer Wiring Kit, Trailer Light Wire, 4 Wire 4 Pin 4 Way
  • Anti-corrosion: Our trailer wiring harness kit use thickened PVC wire coating materials and copper wire. Can resist aging caused by harsh weather.
  • Easy To Install: 18 Gauge Color Coded trailer wire helps distinguish the function of each wire.
  • Wishbone Wire Design: These 4 wire trailer wiring split at the trailer tongue and run down each side of the trailer, no need for splicing wires.
  • 42ft Male Wire & 8ft Female Wire included: These trailer wiring kit can provide enough cable length for trailer lights wire replacement.
  • Universal Application: Our trailer wire harness use standard 4 pin flat plug, Universal fits for 4 way trailer light wire replacement, such as utility trailer, boat trailer etc.
SaleRank No. #3
ONLINE LED STORE 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 Kits
  • 25' MALE & 4' FEMALE INCLUDED- Our 4-way trailer wiring harness includes both the male and female sides for added value.
  • WISHBONE STYLE WIRING SETUP- Wishbone design makes it easier to wire to the taillights; simplifies installation process.
  • SAE J1128 RATED- Meets SAE standards for a low voltage primary cable intended for use at a nominal system voltage of 60 V DC (25 V AC) or less in surface vehicle electrical systems; backed by a 2 year warranty.
  • FOR TRAILERS UNDER & OVER 80" WIDE- Long total wire length (25' plus 4') make this trailer harness kit perfect for trailers measuring under or over 80" wide.
  • 18 AWG COLOR CODED WIRES- Color coded 18 AWG wires clearly identify each wire's function; makes installation safe and straight-forward.
SaleRank No. #4
Hopkins Towing Solutions 48265 30' 4 Wire Flat Trailer Side Y-Harness Connector
  • 30 feet in length
  • Wiring kit for maintaining or re-wiring your trailer
  • Wishbone design allows 2 brown wires to be run to each taillight
  • Corrosion resistant terminals
  • Easy to use and install
Rank No. #5
SUZCO 50' 4 Way Flat Trailer Light Wiring Harness Extension Kit, 42' Male & 8' Female with 4' White Ground Wire,18 AWG Color Coded Wires SAE J1128 & Wishbone-Style for Utility Trailer Lights Kits
  • 【ITEM TYPE】This is our SUZCO custom-made vehicle-specific 50FT male & female 4-flat marine trailer wiring harness with 4-way conductors and a 4' white ground wire, it fits for longer trailers and for customers desiring to wire, made of 18-gauge wire, designed to split at the trailer tongue and run down each side of the trailer. This trailer wire harness kit is completely sealed for a long corrosion-resistant installation.
  • 【50' EXTENSION INCLUDING】This 50foot 4 wire boat trailer wiring extension can conform to the SAE J1128 specification. An extended wiring system provides more flexibility. It can protect tow vehicle electronics from wiring shorts. Includes a 4-feet trunk connector, splices, and clips. This trailer wire harness kit also can work on an aluminum trailer based on the ground wire.
  • 【ENOUGH LENGHT GROUND WIRE】This trailer wire extension with a 4-way flat plug connector is designed to supply power for tail lights, turn and brake lights, as well as a ground connection. The white grounding wire is so enough long to wire. The trailer side ground wire is about 4ft. The trailer wiring harness features a ground wire. The white ground wire is made of 18-gauge, which is a corrosion-resistant terminal.
  • 【4-WAY CONNECTORS & FITMENT】You can install the trailer wire so quickly and easily through the 4-way connectors. 4-pin connectors are available allowing the basic hookup of the three lighting functions (running, turn, and brake lights) plus one pin is provided for a ground wire. Most standard light duty trailers will use a 4-pole flat connector. Not compatible with motorcycle trailer wiring, and you could confirm the fitment to be not the wrong item before ordering.
  • 【4 WIRING INSTRUCTION】The 4 flat trailer wire is color-coded and bonded wire to easily splice into your trailer's wiring system, no need for splicing wires. There are instructions for wiring the running light and license plate lights included. The different color wires are clearly identified as each wire's function, so you can make the installation safe and straightforward.
Rank No. #6
LIMICAR Trailer Wiring Harness Kit, 25ft Trailer Wire, Trailer Wiring Harness with 4 Flat Extension Connector, 4 Pin Flat Wishbond Trailer Wiring for Utility Boat Trailer Light Kit
  • 21FT Male & 4-Flat Female Trailer Wiring Harness Extension Kit: Fits Trailers under & over 80" wide. Wire length (21' & 4') makes this trailer harness kit perfect for trailers measuring under or over 80" wide.
  • 18 AWG Color Coded Wires Wishbone Style Harness: 4 flat trailer wire is color-coded and bonded wire for easily installation. White wire: Ground (Negative). Brown wire: Tail Lights. Yellow wire: Driver Side Stop/Turn Lights. Green wire: Passenger Side Stop/Turn Lights. The white ground wire is made of 18-gauge, reduce corrosion and makes installation safe.
  • 25' Trailer Wiring Harness: Designed to split at the trailer tongue and run down each side of the trailer, 4' trailer side ground wire is enough to use for your trailer. Gives you the extra length, just need to extend current truck to trailer wires. No need to splice your new wires, simply extend them with this extender.
  • 4-Way Flat Trailer Harness Kit: Complying with SAE J1128 standards for a low voltage primary cable. Constructed from the highest quality materials and superior quality guaranteed.
  • Widely Application: Trailer Light Wire Suitable for marine boat trailer, horse trailer, ATV trailer, and other cargo utility trailer hitches (tow/haul vehicle must have 4-way plug). Not compatible with motorcycle trailer wiring. Please confirm the fitment with us before ordering.
Rank No. #7
Trailer Wiring Harness Kit 36ft, Serlainxin Trailer Wiring, Trailer Wiring Kit, Trailer Wire Kit, 4 Pin Trailer Wiring Harness, Trailer Harness, 4 Wire Trailer, 4 Plug Trailer, Trailer Connector
  • Anti-corrosion: Our trailer wiring harness kit use thickened PVC wire coating materials and copper wire. Can resist aging caused by harsh weather.
  • 28ft Male Wire & 8ft Female Wire included: These 4 pin trailer wiring harness can provide enough cable length for trailer wiring replacement.
  • Easy To Install: 18 Gauge Color Coded trailer wiring helps distinguish the function of each trailer wire. Wishbone trailer harness design, split at the trailer tongue and run down each side of the trailer, no need for splicing wires.
  • Universal Application: Our trailer wiring kit use Standard 4 Pin Flat Plug, Universal fits for 4 wire trailer wire kit replacement.
  • SAE J1128 RATED: These trailer wiring harness complies with SAE J1128 standard. Ensure your driving safety.
Rank No. #8
DOAUTO 29Ft 4 Way 4-Pin Flat Trailer Wiring Harness Extension Kit with Dual White Ground Wire, 25' Male & 4' Female Wishbone 18 Gauge Connector with Full Terminal SAE J1128 with 29ft White Ground Wire
  • Wishbone Harness: Comes with 2 white ground wires that can be split into simple wiring.Allows you to run wires to the taillights along each side of the trailer separately without jumper wires.
  • RELIABLE CONNECTION - 4-way flat-plug connector ready to splice into your existing vehicle and trailer wiring, powering tail lights, turn signals and brake lights, as well as ground connections.
  • There are six wires and four pins on the connector. There will be two running light wires (one on each side), a left stop/steer wire, a right stop/steer wire and a ground wire. Running light wires are usually brown/yellow and brown/green, while left stop/turn is yellow, right stop/turn is green, and ground wire is white.
  • This 29ft 6-wire boat trailer wiring extension complies with SAE J1128 specifications. Extended cabling systems provide greater flexibility. It protects the trailer electronics from short circuits in the wiring and is made of the highest quality materials, guaranteeing excellent quality.
  • Suitable for all types of trailers with 4-way plugs fit for boat trailers, horse trailers, motorcycle trailers, ATV trailers and other cargo utility trailer hitches.
SaleRank No. #9
MaxxHaul 4-Pin Flat Trailer Wiring Harness Kit 25' Male and 4' Female [18 Gauge Color Coded Wires] for Utility & Boat Trailer Wire Kits Blue
  • Made from 18 gauge 100 percent copper allowing maximum conductivity and requiring less insulation.
  • Includes both 4' Female and 25' Male color coded, corrosion resistant wiring.
  • Wrapped with UV coated jackets allowing wires to be more durable.
  • Compatible with 12V 4-pin connection trailers less than 80 inch wide.
  • Fully sealed and submersible allowing the wires to be used underwater.
Rank No. #10
4-Way Trailer Wiring Harness Kits, 25-Foot 18 AWG Color Corrosion Resistant Coded Wires with 4 Pin Flat Plug, for Utility Boat Trailer Lights
  • 25ft Wire Harness: 21.65ft length male wire harness and 3.93ft female wire harness
  • 4-way 4-pin hitch trailer wiring harness with connectors
  • Installation easy through the 4-way connectors.
  • Complying with SAE J1128 Standards
  • 18 AWG color coded wiring harness, more durable than the traditional copper coated aluminum wires and split Y-style color coded harness.
Rank No. #11
18AWG 20Feet 4 Flat Trailer Wire Trailer Harness Extenson Cable 4 Way Flat Trailer Connector
  • This 4 pin trailer connector is designed to match industry standard 4way flat sockets, provides a male plug for your trailer and can be used to replace a worn out, broken wire on a wide variety of trailers
  • Material:Made of Pure copper, Wire diameter 18AWG , The safe temperature is below 105 degrees Celsius and the safe voltage is below 300V. It is wrapped with insulating rubber that will never rust or corrode.
  • If you need trailer lines of other sizes and specifications, you can also click on the other links
  • Safe: The hard PVC shell can protect the wire, anti-corrosion, anti-oxidation, and the rubber-coated design at the wire joint can be more effectively waterproof
  • Universal - Compatible With TRAILERS UNDER & OVER 80" WIDE. Suitable for all types of trailers including marine boat trailer, horse trailer, motorcycle trailer, ATV trailer, and other cargo utility trailer hitches
SaleRank No. #12
Seamaka 25ft 4 Wire 4-Flat Trailer Light Wiring Harness Extension Kit, Trailer Wiring Harness with 18 Gauge White Ground Wire for Trailers O-016
  • Product Size: This is a 25-foot 4-way boat trailer extension wire.
  • Material: Made of high-quality materials, it can resist corrosion for a long time.
  • Design: This trailer connecting wire is equipped with a 4-way flat plug connector, which is used to supply power for tail lights, turn signals and brake lights, and grounding connection. It is not necessary to cross a wire from one tail light to another, which is convenient to use and saves time.
  • Application: It is widely used in marine trailers, horse trailers, motorcycle trailers, ATV trailers and other multi-purpose cargo trailer hitch devices (note: there must be 4-way plug).
  • Package: 1 trailer light wiring harness extension.
Rank No. #13
EXERAUO Trailer Light Wiring Kit, 50ft Wiring Harness with 4 Way Flat, Waterproof 18 Gauge 4 Pin Wiring Kit for Utility Trailer, Marine, Boat Trailer
  • Boat Trailer Wiring Harness Kit Waterproof: 50ft trailer wiring harness kit constructed with high quality 18AWG wires ensures fully sealed and waterproof to protect the electronics from short circuits.
  • Trailer Wiring Kit 50ft : 50ft 4 flat trailer wiring harness kit includes 42ft male and 8ft female wires, the flat 4 trailer wiring splits at the trailer tongue and runs along each side of the trailer, providing sufficient cable length without splicing wires.
  • Trailer Wiring Harness Kit 4 pin: This trailer light wiring harness kit has plugs that do not need to be cut, spliced, or replaced. power supply for tail, turn brake lights, and ground connections, 4 way 4 pin flat connector in accordance with SAEJ1128.
  • Wire Tips: White wire: ground, yellow wire: driver side stop/turn(left stop/turn), brown wire: taillight run, green wire: passenger side stop/turn (right stop/turn)
  • Trailer Wiring Kit 4-Way Universal: EXERAUO trailer wiring harness kit suitable for 12V DC trailers, boats, trucks, RV, pickups, buses, vans caravans, and snowmobiles with trailers under and over 80" in width(vehicles must have 4-way plugs)
SaleRank No. #14
Seachoice Trailer Y Harness, Marine Grade, for Wishbone Trailers, 25 Ft. Long, 48 in., Vehicle Side Connectors
  • Designed for wishbone-style trailers
  • Trailer side split allows for quick and easy rewiring down both sides of trailer
  • 25 foot wire harness and 48 inch (4 foot) vehicle wire
  • Marine-grade tinned wire is designed to withstand harsh marine environments
  • Standard flat 4-pin male and female connectors
SaleRank No. #15
CURT 58030 Trailer-Side 4-Pin Flat Wiring Harness with 12-Inch Wires
  • EASY GRIP. Plugging in your trailer wiring and trailer lights is easy with the ergonomic design of this trailer plug. It features tabs on the top and bottom for a better grip when plugging into your vehicle or unplugging
  • RELIABLE CONNECTION. This 4-pin trailer wiring plug comes ready to splice into your existing trailer wiring. It has 16-gauge wires and can be used to connect the taillights, brake lights and turn signals
  • VERSATILE DESIGN. This trailer connector makes a great replacement 4-flat trailer wiring connector. The 4-pin wiring design matches industry-standard 4-way flat sockets and can be used on a wide variety of trailers
  • DURABLE CONSTRUCTION. For long-lasting use and a reliable connection, the housing of this 4-pin trailer wiring plug is made from durable black molded rubber that will never rust or corrode
  • READY TO INSTALL. Equipped with blunt-cut, color-coded wires, this 4-prong trailer wiring plug comes ready to install. The 12-inch wire lead provides extra length for an easy installation
Rank No. #16
LiLoom 36ft 4 Wire Trailer Light Wiring Harness Extension, Kit 4-Way Plug 4 Pin 28' Male & 8' Female with White Ground Wire Extension & Wishbone-Style Wiring Harness for Utility Boat Trailer Lights
  • Wire Length: Our 4-way trailer wiring harness includes 4 Pin 28FT Male & 8FT Female Extension Connector. And this 36 ft trailer wiring harness is made of 18-gauge wire, designed to split at the trailer tongue and run down each side of the trailer
  • Durable and Anti-Corrosive: The use of high-quality pure copper wire and tin-plated layer to achieve the best electrical conductivity and oxidation resistance, and use premium PVC material for the best anti-corrosion and anti-aging ability. Work perfectly even with sea water
  • 4-Way Connectors & Fitment: Male plug with 5 wires, female plug with 4 wires. And you can install the trailer wire so quickly and easily through the 4-way connectors and Matching installation accessories. It matches with any other standard 4 pin flat plugs
  • Color Coded Wires: Wires are color coded and bonded, Green- Right Turn Lights/Brakes, Yellow- Left Turn Lights/Brakes, Brown- Tail Lights/Running Lights, White-Ground Wire
  • Universal Application: The trailer wiring harness is suitable for under 80" wide trailers, such as marine boat trailer, horse trailer and other cargo utility trailer
SaleRank No. #17
MECMO 7-Way Blade to 4-Way Flat Coiled Trailer Wiring Harness 7.5 ft, Pure Cooper Trailer Extension Cord, 18-Gauge Heavy Duty Jacketed Cable Trailer Connector Adapter Plug- 7.5ft (90 Inches)
  • 【Stretchable Length Up to 8Ft】This 7-pin to 4-pin trailer adapter wiring maximum stretches length is 8-foot (96 Inches), while about 7-Foot (84 Inches) in Normal Working Length.(*Note: Please confirm the coiled cable length you need before ordering)
  • 【7 to 4 Way Connector & Extension Adapter】 7 Way to 4 Way flat adaptor allows you to instantly switch from blade 7-wire blade plug to 4-wire flat trailer connector. Eliminates your need for multiple plugs and adapters any popular vehicle wiring system to your trailer. This electrical adapter is designed to adapt a 7-way RV blade vehicle socket to fit a 4-way flat trailer plug.
  • 【Coiled Design】 7 way trailer coiled cable keeps wire from dragging. Stretchable 7 way round to 4 way flat flexible coiled cable with 5ft full extension provides sufficient space and flexible for towing vehicle and trailer.
  • 【Plug & Play Trailer Light Plug】Plug 7 blade into your existing 7-way receptacle and connect your existing 4-pin flat plug on your trailer to the other end of the 4-flat coiled cable. Easy installation, no splicing wire.
  • 【Reliable Quality】18-gauge heavy duty 7 pin to 4 pin trailer adapter extension coiled cable with makes it more durable than usual trailer wiring harness. A rubber dust cover equips with 4-pin connector to protect your terminal from dust and water. Brass and Tin-Plated terminal ensure great conductivity.
Rank No. #18
Serlainxin Trailer Lights Wire, 36ft Trailer Wiring Harness Kit, 4 Pin Trailer Wiring Harness 4 Wire 4 Pin Flat Connector for Trailer Lights, Boat etc…
  • Weather-Resistant Trailer Lights Wire: Our trailer wiring is designed to withstand harsh weather conditions, thanks to its thickened PVC wire coating materials and copper wire. You can trust it to resist aging and corrosion.
  • 4-pin Trailer Wiring Harness: This trailer wiring harness kit comes with everything you need, including wire clips and hooks. You don't have to buy anything separately. Plus, with one 28ft male wire and an 8ft female wire, you'll have plenty of cable length for trailer wire replacement.
  • Easy to Use: Serlainxin 18 Gauge Color Coded trailer wire harness makes it easy to distinguish the function of each wire. The wishbone wire design allows you to split it at the trailer tongue and run it down each side of the trailer, without the need for splicing wires.
  • Universal Application: Our trailer wire kit use standard 4 pin flat plug, Universal fits for 4 wire trailer light wire replacement. Such as utility trailer, boat trailer etc.
  • SAE J1128 RATED: Trailer wiring harness complies with SAE J1128 standard. Ensure your driving safety.
Rank No. #19
Hoypeyfiy Trailer Light Wiring Harness Kit,4 Wires 4-Way Plug 4 pin Flat Wire Extension Male & Female Connector 32" Inch Long
  • This is 32 inch long 4 pin flat wire extension male & female connector
  • This trailer wire extension with 4 way flat plug connector is designed to supply power for tail lights, turn and brake lights, as well as a ground connection.
  • Fits for different types of trailers including marine boat trailer, horse trailer, ATV trailer, and other cargo trailer which have a 4-way plug
  • Trailer wiring harness are colors marked to make installation easier
  • Product have both 4 pin vehicle side and 4 pin trailer side
SaleRank No. #20
Hopkins Towing Solutions 48255 25' 4 Wire Flat Trailer Side Y-Harness Connector
  • 25 feet in length
  • Wiring kit for maintaining or re-wiring your trailer
  • Wishbone design allows 2 brown wires to be run to each taillight
  • Corrosion resistant terminals
  • Easy to use and install

Last update on 2023-07-30 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

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  1. Brand Value: Every brand of Boat Trailer Wiring Harness has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an Boat Trailer Wiring Harness?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your Boat Trailer Wiring Harness.
  5. Customer Ratings: Number ratings grade Boat Trailer Wiring Harness objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Boat Trailer Wiring Harness.
  7. Product Quality: You don’t always get what you pay for with an Boat Trailer Wiring Harness, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an Boat Trailer Wiring Harness is should be an indication of how long it will work out for you.

We always remember that maintaining Boat Trailer Wiring Harness information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding Boat Trailer Wiring Harness is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly! We’re here for you all the time. Contact us here. Or You can read more about us to see our vision.

FAQ:

Q: What is trailer wiring?

A: A trailer wiring system is grounded to the frame near the coupler and each light also needs to be grounded. If there is not a white ground wire coming out of a trailer light, then the light is grounded through its mounting studs. Too much paint, dirt, or rust can cause bad grounds,…

Q: What is the color code for trailer wiring?

A: Trailer wiring and harness plugs are available in a variety of sizes and configurations. The most basic of designs is the color coded 4-WIRE system which uses a brown wire for tail, license, and side marker lights, yellow wire for left hand stop and turn, green wire for right hand stop and turn, and white wire for system ground.

Q: What color is trailer wire?

A: Trailers should be wired to code, meaning that each colored wire represents a part of the system. Green is the right turn signal and brake light, yellow is the left turn signal and brake light, orange is the tail or marker lights, white is the ground wire, red is the auxiliary power wire, blue is the electric brakes and pink is the backup lights.

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