So, you’ve got your trailer connected to your truck with the right hitch, ball mount and trailer ball. You’re ready to go, but what about your trailer lights? If the trailer connector doesn’t match the one on your tow vehicle, or if the vehicle doesn’t even have a plug, stick around. From basic exterior lights to 12-volt powered accessories, all trailers need electric power supplied by your vehicle, and we have everything needed to make a hassle-free connection including extensions, connectors, harnesses and adapters.

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    • (1 review)
      # sp104893
      Adapters by CURT®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by Curt will last a lifetime. It will meet your needs...
      Will perfectly meet your needsOutperforms competitors
      $10.28 - $21.00
    • (60 reviews)
      # sp111100
      Connectors by CURT®. This provides all you need to connect a trailer to the tow vehicle. Generous length allows plenty of wire. Female end is for tow vehicle, male end for trailer.
      Custom fitAmple length
      $9.44 - $90.97
    • (10 reviews)
      # sp24027
      T-One Connector by Tekonsha®. Wire up your tow vehicle and trailer with whatever it takes to get your trailer lights on, the electric brakes slowing down, and the trailer battery charging. From simple wiring connectors, to connectors...
      Plug and Play T-harnesses to connect to vehicle wiringTrailer wiring connectors, for both truck and trailer
      $11.89 - $159.41
    • (4 reviews)
      # sp104894
      Converters by CURT®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by Hooker will last a lifetime. It will meet your...
      Will perfectly meet your needsOutperforms competitors
      $20.84 - $47.84
    • (0 reviews)
      # sp123368
      Towed-Vehicle RV Harness by CURT®. Whether you are towing cross-country or hitting the family campground, 5th wheel trailers offer superior comfort, towing, and construction. Combine these amenities with a Curt Inc. 5th wheel hitch and...
      Industry standard rail system for interchangeabilityTrailer weight ratings to 24000 lbs
      $39.11 - $87.27
    • (5 reviews)
      # sp2847
      Multi-Tow™ Towing Wiring Kit by Hopkins®. Unplug your vehicle's factory wiring harness and plug in a Hopkins vehicle wiring harness. That's how easy trailer wiring is with a Plug-In-Simple! wiring kit, featuring Exact OEM Fit...
      Provides multiple towing options from one connectorPlug-In Simple®: No cutting, No splicing - Saves time
      $21.45 - $38.82
    • (0 reviews)
      # sp46949
      Wiring Components by Tekonsha®. This product is made from high-grade materials to meet the strictest standards of high quality. Designed with the utmost care and attention to detail, this Tekonsha product ensures superior reliability....
      No Cutting Or Splicing Vehicle WiringIsolates Trailer Light Operation from Tow Vehicle's Electrical System
      $123.86
    • (2 reviews)
      # sp102784
      Towing Wiring Harness by Westin®. Connectors wire directly into your vehicle's factory tail light to allow you to connect a trailer lighting and wiring system directly into your vehicle. This product is made from high-grade materials to...
      2 Wire And 3 Wire Systems AvailableInstalls Cleanly Into The Vehicle's Taillights
      $13.38 - $84.72
    • (1 review)
      # sp123393
      Trailer T-Connector Harness by Westin®. T-Connectors wire directly into your vehicle's factory tail light to allow you to connect a trailer lighting and wiring system directly into your vehicle.
      2 Wire And 3 Wire Systems AvailableInstalls Cleanly Into The Vehicle's Taillights
      $47.64 - $59.80
    • (0 reviews)
      # mpn4475501580
      T-Connector by Crown®. 4-Flat. Crown Automotive is just the ticket if you want to get the most out of your vehicle as well as revel in a more exciting driving experience. You will surely get a real bang for the buck!
      Ideal to make trailer towing safer and easierMade from the highest-quality materials to last for years to come
      $33.25
    • (0 reviews)
      # mpn4475501586
      Towing Wiring Harness by Outland Automotive®. 4-Flat. If you own a truck or SUV, you need Outland Accessories. Outland features a full line of Truck / SUV Tube Steps, Bull Bars, All Terrain Floor Liners, Consoles and other functional...
      Ideal to make trailer towing safer and easierMade from the highest-quality materials to last for years to come
      $33.25
    • (0 reviews)
      # mpn1298265
      Towing Wiring Harness by Rugged Ridge®. Personalize and customize your Jeep with attractive chrome, stainless steel or black trim parts from Rugged Ridge. Trim parts that shine or are in a contrasting color will make your Jeep stand out...
      Ideal to make trailer towing safer and easierMade from the highest-quality materials to last for years to come
      $34.99
    • (0 reviews)
      # mpn1692317
      Tow Wiring Harness by Smittybilt®. This wiring harness will make connecting the trailer wiring to your vehicle a plug n' play operation. It's specifically designed for the application and features OEM quality connectors and a rugged...
      Custom-engineered to fit your vehicleDesigned to OEM specifications
      $30.99
    • (3 reviews)
      # 470457652
      Universal 4-Way Flat Dual-Output Electrical Adapter by CURT®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by Curt...
      Ideal to make trailer towing safer and easierMade from the highest-quality materials to last for years to come
      $18.25 - $28.43
    • (0 reviews)
      # 470454634
      Universal 7-Way RV Blade Replacement Harness by CURT®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by Curt will last...
      Ideal to make trailer towing safer and easierMade from the highest-quality materials to last for years to come
      $21.00 - $30.66
    • (0 reviews)
      # 625474412
      Universal Towed-Vehicle RV Harness Add-On by CURT®. One Year Limited. Whether you are towing cross-country or hitting the family campground, 5th wheel trailers offer superior comfort, towing, and construction. Combine these amenities...
      Connects a towed vehicle to an RV using a standard 4-way flat trailer plugSimple plug-and-play design eliminates the need for cutting or splicing
      $15.47 - $29.49
    • (0 reviews)
      # 566251914
      Universal 25' Brake Control Wiring Kit by Tow Ready®. One-year warranty. Includes all necessary parts required to completely install all brake controls. No other parts are necessary. Look to CARiD for all of your trailering/towing...
      Pre-wired 7-Way round connectorHeavy duty flasher
      $34.97 - $41.01
    • (1 review)
      # mpn2212899
      Universal Trailer Light Power Module Wiring Kit by Tow Ready®. One-year warranty. Wire up your tow vehicle and trailer with whatever it takes to get your trailer lights on, the electric brakes slowing down, and the trailer battery...
      Wiring kit for installing all Modulitesincludes 10 AMP fuse
      $15.81
    • (1 review)
      # 464407758
      Universal Endurance™ Flex Adapter by Hopkins®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as left/right turn, tail light, auxiliary, ground,...
      Provides for flexible reach3-Year Warranty
      $17.02 - $18.20
    • (1 review)
      # mpn29441651
      Universal Endurance™ Straight Wire 7 RV Blade to 4 Round Kit by Hopkins®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as left/right turn, tail...
      8 foot lengthEasy-grip, heavy-duty connectors with heavy-duty cable
      $54.56
    • (0 reviews)
      # mpn4491924570
      Universal 7 Way Complete Tow Harness Kit by Tekonsha®. One-year warranty. Including ModuLite® HD Protector with Backup and Brake Control Harness. Wire up your tow vehicle and trailer with whatever it takes to get your trailer lights...
      Ideal to make trailer towing safer and easierMade from the highest-quality materials to last for years to come
      $94.19
    • (0 reviews)
      # mpn553115065
      Universal 7-Way Towing Wiring Harness Prep Kit by Tekonsha®. One-year warranty. Includes ModuLite® HD Protector with Backup and Brake Control Harness. Look to CARiD for all of your trailering/towing accessories and replacement parts.
      Allows for fully functional 7-Way (Tail Lights, Left/Right turn, Brake, Reverse, Electric Brakes and 12 Volt +)Short circuit and overload protection on all circuits including reverse
      $110.39
    • (0 reviews)
      # mpn553115055
      Universal Wiring Kit for Installing Power Modules by Tekonsha®. One-year warranty. For use with #119147, #119177, #119179, #119180, #119190, #119192 ModuLite® Power Modules. Look to CARiD for all of your trailering/towing accessories...
      Upgraded wiring kit for installing all ModulitesIncludes 20' pre-wrapped in comvulted tubing
      $23.93
    • (0 reviews)
      # 267969490
      Universal ZCI™ Zero Contact Interface T-Connector by Tekonsha®. One-year warranty. ZCI sensor technology and direct connection to the tow vehicle battery, eliminates all electrical connection and interference with the tow vehicle...
      NO CUTTING OR SPLICING VEHICLE WIRING!Isolates Trailer Light Operation from Tow Vehicle's Electrical System
      $148.83 - $159.52
    • (4 reviews)
      # mpn2569444
      Universal 2" 4-Flat Extension Harness by Wesbar®. Without Hardware. One-year warranty. 2' Length. Wire up your tow vehicle and trailer with whatever it takes to get your trailer lights on, the electric brakes slowing down, and the...
      Best Selling ItemsDesigned for 2' or 4' Wide x 4' High Areas
      $6.06
    • (4 reviews)
      # 267977380
      Universal 4-Flat Loop by Wesbar®. With Hardware. One-year warranty. Color coded harnesses in various lengths available with car and trailer end connectors. Trailer ends can be purchased in straight lengths, loops, wunside or wishbone...
      Ideal to make trailer towing safer and easierMade from the highest-quality materials to last for years to come
      $4.11 - $5.85
    • (2 reviews)
      # mpn1094023
      Universal 2-to-3-Wire Tail Light Converter by CURT®. Converts 2-wire system to 3-wire system. Turn and Brake Circuits: 2.1 Amps Per Circuit. This product is made of high-quality materials to serve you for years to come. Designed using...
      Converts a 2-wire electrical system to 3-wireConstructed with SMT circuitry for better performance and durability
      $18.47
    • (2 reviews)
      # mpn4477336860
      Universal 24-Volt Tail Light Converter by CURT®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by Curt will last a...
      Primarily used for 24V automotive systems, busses, trucks and cab and chassis wiringEquipped with a 24-volt 3-wire to 2-wire tail light converter
      $15.86
    • (2 reviews)
      # mpn1096157
      Universal 3-Wire Systems to 2-Wire Systems Adapter by CURT®. 2.1 Amp Turn/Brake, 4.2 Amp Tail Light. Provides a 4-way flat connector. This product is made of high-quality materials to serve you for years to come. Designed using...
      4-way flat output connects tail lights, brake lights and turn signalsConstructed with SMT circuitry for better performance and durability
      $23.76
    • (2 reviews)
      # 810177795
      Universal Non-powered 3-to-2-Wire Tail Light Converter by CURT®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by Curt...
      Ideal to make trailer towing safer and easierMade from the highest-quality materials to last for years to come
      $9.86 - $360.53




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    There are a number of standardized trailer connectors, such as 4-pin flat/round, 5-pin flat, 6-pin square/round, and 7-pin round. The simplest 4-pin system is used for small trailers, and has one ground pin, one pin each for left and right turn signals and brake lights, and one for the running lights. 5-pin flat connectors add a wire for the back-up lights. If the trailer is equipped with surge brakes, this circuit also disengages the brakes when the vehicle is backing up.

    In addition to connections for turn signals, brake lights, tail lights and ground, 6-pin connectors have one terminal each for electric brakes and 12-volt accessories. 6-pin connectors come in square and round styles and are common to gooseneck and 5th wheel trailers, boat trailers and campers. 7-pin connectors are most commonly found on new vehicles that are prewired for towing. Along with the same functions as a 6-pin connector, this connector has a 7th circuit that is for the back-up lights. 7-pin connectors come with round or RV blade-style pins. Fortunately, no matter what connector you have on your trailer, we have the wiring harnesses that will let you plug into your vehicle’s electrical system.

    The first thing you have to determine is whether your vehicle has a factory installed trailer towing package. If it does, you’ll find an electrical connector at the rear of the vehicle, usually on or near the bumper. If the shape and number of pins (wires) on the vehicle connector matches the one on your trailer, then all you’ll need is a wiring harness of sufficient length with the same connector at each end. If not, we can supply you with a plug-and-play adapter harness that will make all your trailer electrical functions work, without any cutting and splicing. For example, if your truck has a 7-pin round connector but your trailer has a 4-pin flat connector, one of our adapter harnesses will have you connected in minutes.

    But don’t worry if your vehicle isn’t already set up for towing, we can still get you connected without much hassle. For most vehicles we offer a plug-and-play T-shaped harness (so called because it connects to both of your tail lights) that connects your vehicle lights to the trailer lights. If you have an obscure vehicle for which no T-shaped harness is available, we can still help, but some splicing will be necessary. And if your vehicle uses separate bulbs for the brake lights and turn signals but your trailer uses one bulb for both, we can supply you with a converter harness that will make the connection simple. We also have a large assortment of brackets, connectors, sockets, and anything else you need to get connected.

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    Towing Electrical & Wiring Reviews

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