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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    • (60 reviews)
      # sp111100
      T-Connector 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 - $86.57
    • (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
      $13.22 - $183.87
    • (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
      $22.28 - $41.81
    • (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 CARiD 5th wheel hitch and you...
      Industry standard rail system for interchangeabilityTrailer weight ratings to 24000 lbs
      $34.18 - $77.81
    • (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
      $22.93 - $41.98
    • (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
      $126.81
    • (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
      $10.04 - $97.60
    • (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
      $48.35 - $63.79
    • (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
      $32.03
    • (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
    • (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 Hooker will last a lifetime. It will meet your...
      Will perfectly meet your needsOutperforms competitors
      $10.28 - $22.45
    • (0 reviews)
      # sp123366
      Hitch Wiring 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
      $12.05
    • (0 reviews)
      # sp98383
      6-7 Way Connectors by Tow Ready®. 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...
      Plug and Play T-harnesses to connect to vehicle wiringTrailer wiring connectors, for both truck and trailer
      $43.02 - $83.81
    • (1 review)
      # mpn3526390337
      OE Multi-Tow® 7 Blade and 4 Flat Replacement Connector by Hopkins®. Quantity per Package: 1. 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...
      Ideal to make trailer towing safer and easierMade from the highest-quality materials to last for years to come
      $32.05
    • (7 reviews)
      # sp2849
      Towing Wiring Harnesses 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 connectors for...
      OEM connectors exactly match a tow vehicleEnsure a perfect, weather-tight fit
      $12.20 - $91.66
    • (0 reviews)
      # mpn767362081
      GM Original Equipment™ 2-Pin Male Black Brake Pressure Switch Connector by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $19.84
    • (0 reviews)
      # mpn776128111
      GM Original Equipment™ 8-Pin Male Black Electronic Brake Harness Connector by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $53.31
    • (0 reviews)
      # sp11689
      GM Original Equipment™ Trailer Brake Continue Relay Assembly by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $36.69
    • (0 reviews)
      # sp10415
      GM Original Equipment™ Trailer Tow Harness Connector by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $19.84 - $122.75
    • (0 reviews)
      # sp93923
      Professional Inline to Trailer Wiring Harness Connector by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $25.35 - $50.21
    • (0 reviews)
      # mpn767362048
      Professional™ Trailer Tow Relay Connector by ACDelco®. 5 Terminal Female. Black. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $7.92
    • (0 reviews)
      # mpn767362048
      Professional™ Trailer Tow Relay Connector by ACDelco®. 5 Terminal Female. Black. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $7.92
    • (0 reviews)
      # mpn767362048
      Professional™ Trailer Tow Relay Connector by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $7.92
    • (0 reviews)
      # mpn2203352788
      Trailer Tow Harness Connector by Dorman®. 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 Dorman will last a lifetime....
      Ideal to make trailer towing safer and easierMade from the highest-quality materials to last for years to come
      $55.95
    • (0 reviews)
      # sp27905
      Trailer Connector Kit by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the highest reputation for integrity to all...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $11.25 - $161.88
    • (0 reviews)
      # sp104899
      Wiring Accessories 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...
      Will perfectly meet your needsOutperforms competitors
      $19.86 - $25.49
    • (0 reviews)
      # sp27386
      Fuse Bypass by Blue Ox®. This superior fuse bypass switch provides a safe alternative to the constant removal and reinstallation of the fuse when changing from the towed mode to the driving mode. Once installed, it allows to disconnect...
      Disconnects your vehicle's fuse with the flip to prep your vehicle to be towedBypasses towed car's fuse to tow without draining battery
      $76.32 - $207.43
    • (1 review)
      # sp111301
      EZ Light Wiring Harness (BX88280) by Blue Ox®. 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...
      Designed to safely and efficiently haul your loadsMade from the highest quality materials
      $225.00 - $227.39




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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

    Average rating:  4.5  4.5 - 235 reviews
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    4 of 5
    Nice Converter
    Tail light converter was installed on a 2004 Jetta everything I needed was included. Install was easy and works great!!
    GPosted by Gavin (Desbarats, ON) / January 4, 2018
    2004 Volkswagen Jetta
    Was this review helpful for you? Yes
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