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Trailer Harness – The 15 best products compared

SaleComparison winner of the editors CURT 58030 Trailer-Side 4-Pin Flat Wiring Harness with 12-Inch Wires

Trailer Harness – The 15 best products compared

Recommended products regarding the topic “Trailer Harness”

We have compared products in the section “Trailer Harness”. Here you can find the top 15 in the category “Trailer Harness”.

Trailer Harness – the most important at a glance

A trailer harness, also known as a trailer wiring harness, is essential for safely connecting a trailer’s electrical system to the towing vehicle. It ensures the lights, brakes, and signals on your trailer function correctly for safe and legal towing. Various trailer harnesses on the market serve different types of trailers, with the most common types being the 4-way and 7-way connectors. The 4-way connector is often used for smaller trailers, offering three main light functions: running, turn, and brake lights. In contrast, the 7-way connectors cater to larger trailers with more advanced features including provision for an electric brake control, auxiliary power, and reverse lights. The best choice depends on your trailer’s specific needs and the laws in your area.

Bestsellers in “Trailer Harness”

A list of bestsellers under the category “Trailer Harness” you can find here. Here you can see which products other users have bought especially often.

SaleBestseller No. 1
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
Bestseller No. 2
SUZCO 25 Foot 4 Wire 4-Flat 21" Male & 4" Female Trailer Light Wiring Harness Extension Kit, 4-Way Plug 4 Pin Extension Connector & Wishbone-Style with 18 Gauge White Ground Wire with SAE J1128
  • 【ITEM TYPE】This is a 21ft male & 4 ft female 4-flat marine trailer wiring harness with 4-way conductors and a 2ft white ground wire, made of 18-gauge wire, designed to split at the trailer tongue and run down each side of the trailer. 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. This trailer wire harness kit is completely sealed for a long corrosion-resistant installation.
  • 【EXTENSION INCLUDING】This 25foot 4 wire boat trailer wiring extension can conform to the SAE J1128 specification. Extends 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 COPPER trailer based on the ground wire.
  • 【ENOUGH LENGHT GROUND WIRE】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. The white grounding wire is so enough long to wiring. The trailer side ground wire is about 2ft. Trailer wiring harness features a ground wire. The white ground wire is made of 18-gauge, which is 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】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 straight-forward.
Bestseller No. 3
CURT 58050 Vehicle-Side and Trailer-Side 4-Pin Flat Rubber Wiring Harness with 72-Inch Wires
  • EASY GRIP. Plugging in your trailer wiring and trailer lights is easy with the ergonomic design of these vehicle-trailer connectors. They feature tabs on the top and bottom for a better grip when plugging in or unplugging
  • RELIABLE CONNECTION. These 4-pin trailer wiring plugs come ready to splice into your existing vehicle and trailer wiring. They have 16-gauge wires and can be used to connect the taillights, brake lights and turn signals
  • VERSATILE DESIGN. These vehicle-trailer connectors make great replacement 4-flat wiring plugs and sockets. The 4-pin wiring design matches industry-standard 4-way flat connectors and is compatible with a wide variety of trailers
  • DURABLE CONSTRUCTION. For long-lasting use and a reliable connection, the housing of these 4-pin trailer wiring plugs is made from durable black molded rubber that will never rust or corrode
  • READY TO INSTALL. Equipped with color-coded wires, these 4-prong trailer wiring connectors come ready to install. The 72-inch wire loop provides plenty of extra length for a flexible installation
Bestseller No. 4
LIMICAR Trailer Wiring Harness Kit, 25ft Trailer Wire with 4 Flat Extension Connector, 4 Pin Flat Wishbond Wiring Light Kit for Utility Boat
  • 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.
SaleBestseller No. 5
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.
Bestseller No. 6
CURT 56429 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Chevrolet Equinox, GMC Terrain , Black
  • EASY TO INSTALL. No cutting! No splicing! This trailer wiring harness kit plugs into existing factory wiring on your vehicle and equips it with a standard, rear 4-pin trailer wiring connector for plugging in and towing a trailer.Fit Type: Vehicle Specific
  • STANDARD CONNECTOR. This plug-in 4-flat trailer wiring can be used to connect trailer tail lights, brake signal lights and turn signals. 4-way trailer light wiring is popular on a wide variety of trailers, adding versatile towing options for your vehicle
  • VEHICLE-SPECIFIC. This vehicle-trailer wiring harness is designed for select models of the Chevrolet Equinox and GMC Terrain (factory tow package required)
  • EASY GRIP. Plugging in your trailer wiring and trailer lights is easy with the ergonomic design of this vehicle socket. It features tabs on the top and bottom for a better grip when plugging into your trailer or unplugging
  • DUST COVER. To promote long-lasting use and weather resistance, this 4-pin trailer wiring harness comes with a rubber dust cover. It easily fits onto the 4-way flat connector when not in use, protecting it against the outdoor elements
Bestseller No. 7
CURT 56462 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Compatible with Select Ford Bronco, Black
  • EASY TO INSTALL. No cutting! No splicing! This trailer wiring harness kit plugs into existing factory wiring on your vehicle and equips it with a standard, rear 4-pin trailer wiring connector for plugging in and towing a trailer
  • STANDARD CONNECTOR. This plug-in 4-flat trailer wiring can be used to connect trailer tail lights, brake signal lights and turn signals. 4-way trailer light wiring is popular on a variety of trailers, adding versatile towing options for your vehicle
  • VEHICLE-SPECIFIC. This aftermarket, vehicle-trailer wiring harness is designed for select years of the Ford Bronco
  • RELIABLE POWER. This 4-way trailer wiring harness is built with surface mount technology. This type of circuitry generates less heat, optimal light intensity and durable performance
  • DUST COVER. To promote long-lasting use and weather resistance, this 4-pole trailer lighting wire harness comes with a rubber dust cover. It easily fits onto the 4-way flat connector when not in use, protecting it against the outdoor elements
SaleBestseller No. 8
Curt Manufacturing 56210 Vehicle-Side Custom 4-Pin Trailer Wiring Harness,Fits Select Chevrolet Equinox,GMC Terrain
  • EASY TO INSTALL. No cutting! No splicing! This trailer wiring harness kit plugs into existing factory wiring on your vehicle and equips it with a standard, rear 4-pin trailer wiring connector for plugging in and towing a trailer
  • STANDARD CONNECTOR. This plug-in 4-flat trailer wiring can be used to connect trailer tail lights, brake signal lights and turn signals. 4-way trailer light wiring is popular on a wide variety of trailers, adding versatile towing options for your vehicle
  • VEHICLE-SPECIFIC. This aftermarket, vehicle-trailer wiring harness is designed for select years of the Chevrolet Equinox and GMC Terrain (factory tow package required)
  • EASY GRIP. Plugging in your trailer wiring and trailer lights is easy with the ergonomic design of this vehicle socket. It features tabs on the top and bottom for a better grip when plugging into your trailer or unplugging
  • DUST COVER. To promote long-lasting use and weather resistance, this 4-pole trailer lighting wire harness comes with a rubber dust cover. It easily fits onto the 4-way flat connector when not in use, protecting it against the outdoor elements
Bestseller No. 9
7 Pin Trailer Plug Wiring Harness (8ft)with 7 Gang Waterproof Junction Box, Heavy Duty 7 Way RV Trailer Replacement Wiring Harness Kit
  • 【PRACTICAL TRAILER CORD SET】This set includes a 7-way trailer cord with junction box for your trailer wiring, It provides a fast and simplified way for wire connection to achieve safer traction
  • 【CONVENIENT TRAILER WIRING】color marked 7-poles that can be easily identified,t can be used to connect the taillights, brake lights, reverse lights, turn signals, trailer brakes and auxiliary power. Pre-wired junction box makes it much easier for wire connections
  • 【ROBUST AND DURABLE】100% copper wire ensures great conductivity, soft and rugged PVC material jacket providing flexibility in use. Explosion proof ABS junction box and rubber grommet provide excellent protection, keeping them safe from dirt, rain, corrosion and other threats
  • 【APPLICATIONS】: Perfect for connecting tail, brake, reverse, turn signals and auxiliary power of your trailers, RVs, campers, caravans, food vans and other towed vehicles. Please carefully read the instructions before any operations on the product.
  • 【PACKAGE INCLUDES】Package includes: 1pcs 7-way trailer plug with junction box, 4pcs split grommet, 4pcs closed grommet, 5pcs fixing strap & Instructions. It can be selected according to your wiring needs to make the whole junction box waterproof, dust-proof and corrosion resistant.
SaleBestseller No. 10
Curt Manufacturing 55336 Vehicle-Side Custom 4-Pin Trailer Wiring Harness,Fits Select Honda Accord,CR-V,Odyssey,Pilot,Acura Integra,CL,RL,TL,MDX
  • EASY TO INSTALL. No cutting No splicing This trailer wiring harness kit plugs into existing factory wiring on your vehicle and equips it with a standard, rear 4-pin trailer wiring connector for plugging in and towing a trailer.Fit Type: Vehicle Specific
  • STANDARD CONNECTOR. This plug-in 4-flat trailer wiring can be used to connect trailer tail lights, brake signal lights and turn signals. 4-way trailer light wiring is popular on a wide variety of trailers, adding versatile towing options for your vehicle
  • VEHICLE-SPECIFIC. This aftermarket, vehicle-trailer wiring harness is designed for select years of the Honda Accord, CR V, Element, Odyssey, Pilot and Prelude, Acura Integra, CL, RL, TL and MDX and Isuzu Oasis (factory tow package required)
  • RELIABLE POWER. This 4-way trailer wiring harness is built with surface mount technology. This type of circuitry generates less heat, optimal light intensity and durable performance
  • DUST COVER. To promote long-lasting use and weather resistance, this 4-pole trailer lighting wire harness comes with a rubber dust cover. It easily fits onto the 4-way flat connector when not in use, protecting it against the outdoor elements

Our Winner:

SaleWinner in comparison
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

Current offers for “Trailer Harness”

You want to buy the best products in “Trailer Harness”? In this bestseller list you will find new offers every day. Here you will find a large selection of current products in the category “Trailer Harness”.

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