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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    • (34 reviews)
      # sp7830
      Towing Wiring Harness 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. You can cut it to appropriate length to...
      Custom fitAmple length
      $9.43 - $76.29
    • (1 review)
      # sp934
      5th Wheel Harness by Bargman®. 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
      $43.83 - $77.83
    • (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...
      OEM connectors exactly match a tow vehicleEnsure a perfect, weather-tight fit
      $12.18 - $91.49
    • (4 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
      $22.88 - $35.88
    • (0 reviews)
      # sp2848
      5th Wheel Harness 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 a...
      Plug-In Simple!® 7 Blade with reinforced 90° angle installs easily in hard to reach placesPlugs directly into OEM wiring system
      $59.29 - $67.36
    • (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...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $35.80
    • (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
      $30.79 - $146.75
    • (2 reviews)
      # sp22605
      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
      $11.43 - $113.30
    • (1 review)
      # sp23031
      LED Trailer Light Adapter 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...
      Industry standard rail system for interchangeabilityTrailer weight ratings to 24000 lbs
      $22.46
    • (0 reviews)
      # sp927
      5th Wheel Harness 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
      $52.20 - $77.78
    • (8 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...
      Plug and Play T-harnesses to connect to vehicle wiringTrailer wiring connectors, for both truck and trailer
      $10.73 - $93.20
    • (0 reviews)
      # sp67129
      5th Wheel Trailer Harness Kit by Merchant Automotive®. Easy installation, no cutting or splicing of factory wiring required, all factory connections for years of trouble free service.
      High quality at an affordable priceExpertly made from premium materials
      $124.69
    • (0 reviews)
      # sp74616
      Tow Hitch 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...
      Gives your Jeep a custom lookMade from powder coated steel, stainless steel or UV treated plastic
      $28.99
    • (0 reviews)
      # sp23033
      Hitch Wiring by CURT®. CARiD has everything you need to set up your car or truck to tow, starting with CURT hitches and accessories. Tow in comfort and safety with the proper gear, and make your life easier around the campsite or...
      Will perfectly meet your needsOutperforms competitors
      $14.85 - $59.19
    • (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...
      Disconnects your vehicle's fuse with the flip to prep your vehicle to be towedBypasses towed car's fuse to tow without draining battery
      $55.98 - $176.51
    • (0 reviews)
      # sp25447
      Trailer Hitch Electrical Connector Plugs by Dorman®. Restore the brake lights and turn signal on your trailer to proper operation with Dorman’s Trailer Hitch Plug. The Plug is constructed from durable materials to protect the...
      Hitch Plug cap flips over to prevent corrosion and other damageDirect replacement for a proper fit
      $21.52 - $21.60
    • (2 reviews)
      # sp35627
      Universal Adapters by Bargman®. 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
      $9.34 - $16.83
    • (0 reviews)
      # sp79096
      Universal 7-Pin Wiring Pigtail Harness by Torklift®. Needed when you have a camper on the truck and are using a hitch extender.
      High quality at an affordable priceExpertly made from premium materials
      $76.99
    • (1 review)
      # sp39980
      Universal Connector by Hopkins®. To have a greater peace of mind when driving with a trailer, go with this perfect accessory that is sure to provide you with a safe, secure connection. Made of sturdy, corrosion-resistant materials,...
      Ensure a perfect, weather-tight fitBuilt of durable materials to last
      $2.36 - $18.37
    • (0 reviews)
      # sp39991
      Universal Molded Cable by Hopkins®. To ensure a secure and reliable connection and consolidate all of the electrical towing functions of your trailer into a single plug, go with this great add-on by Hopkins. Typically used with...
      Designed for larger trailers (RV and industrial)Heavy-duty construction to last a long time
      $20.09 - $38.85
    • (0 reviews)
      # sp53550
      Universal Wire Terminal Connector by Blue Ox®. Designed to prevent electrical feedback when the towed vehicle light system is connected to the RV's brake light wiring, this superior replacement Diode Block by Blue Ox contains one...
      Replacement diode for BX8847 wiring kitsPrevents electrical feedback and the damage to your towed vehicle's electrical components
      $15.79 - $31.57
    • (1 review)
      # sp48023
      6-7 Way Connectors by Wesbar®. 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
      $21.81
    • (0 reviews)
      # sp41575
      Universal Hitch Wiring by Magic Tilt®. 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. It will meet your needs and deliver great...
      Expertly crafted from premium materialsDesigned to match rigorous quality standards
      $6.54 - $16.75
    • (0 reviews)
      # sp70886
      Universal Frame Clip 12pc by Optronics®. 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. It will meet your needs and deliver...
      Expertly crafted from premium materialsDesigned to match rigorous quality standards
      $3.08
    • (0 reviews)
      # sp35670
      Universal Lightning Mounting Brackets by Bargman®. Look to CARiD for all of your trailering/towing accessories and replacement parts.
      Manufactured from the top-grade materialsCreated to improve your vehicle's functionality
      $1.28 - $9.06
    • (0 reviews)
      # sp51854
      Universal Mounting Bracket by Bargman®. Look to CARiD for all of your trailering/towing accessories and replacement parts.
      Manufactured from the top-grade materialsCreated to improve your vehicle's functionality
      $1.46 - $12.02
    • (0 reviews)
      # sp46928
      Universal Hitch Wiring by Tectran®. 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 Tectran will last a...
      Expertly crafted from premium materialsDesigned to match rigorous quality standards
      $1.62 - $12.59
    • (0 reviews)
      # sp37427
      Combination Lights by CURT®. CARiD has everything you need to set up your car or truck to tow, starting with CURT hitches and accessories. Tow in comfort and safety with the proper gear, and make your life easier around the...
      Will perfectly meet your needsOutperforms competitors
      $1.75 - $55.63
    • (4 reviews)
      # sp37433
      Hitch Wiring MMY Group by CURT®. CARiD has everything you need to set up your car or truck to tow, starting with CURT hitches and accessories. Tow in comfort and safety with the proper gear, and make your life easier around the...
      Will perfectly meet your needsOutperforms competitors
      $9.88 - $31.34
    • (4 reviews)
      # sp37431
      Hitch Accessories MMY Group by CURT®. CARiD has everything you need to set up your car or truck to tow, starting with CURT hitches and accessories. Tow in comfort and safety with the proper gear, and make your life easier around...
      Will perfectly meet your needsOutperforms competitors
      $2.74 - $74.41
    • (3 reviews)
      # sp35658
      Universal Connectors by Bargman®. 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
      $5.02 - $51.01
    • (1 review)
      # sp35618
      Universal Accessories by Bargman®. Look to CARiD for all of your trailering/towing accessories and replacement parts.
      Manufactured from the top-grade materialsCreated to improve your vehicle's functionality
      $0.68 - $19.08
    • (0 reviews)
      # sp51853
      Universal Pigtail Wiring by Bargman®. Look to CARiD for all of your trailering/towing accessories and replacement parts.
      Manufactured from the top-grade materialsCreated to improve your vehicle's functionality
      $0.94 - $5.13
    • (0 reviews)
      # sp47166
      Installation Kits by Tow Ready®. Look to CARiD for all of your trailering/towing accessories and replacement parts.
      Manufactured from the top-grade materialsCreated to improve your vehicle's functionality
      $6.16
    • (2 reviews)
      # sp47148
      2-4-5 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
      $41.29
    • (1 review)
      # sp23447
      Endurance Connector by Hopkins Towing®. To have a greater peace of mind when driving with a trailer, go with this perfect accessory that is sure to provide you with a safe, secure connection. Made of sturdy, corrosion-resistant...
      Ensure a perfect, weather-tight fitBuilt of durable materials to last
      $14.42 - $48.75
    • (0 reviews)
      # sp62713
      Universal Convoluted Tubing by Hopkins®. If you're looking for the most advanced solution when it comes to the protection and management of your trailer wiring, then you definitely need this great add-on that will shield your...
      Protects your wiring harness from harsh environmentsDurable yet flexible plastic sheathing
      $4.68 - $4.72
    • (1 review)
      # sp39966
      Universal 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, and electric...
      Durable construction to last a long timeHeavily insulated wires with jacketed sleeving
      $2.77 - $59.29
    • (6 reviews)
      # sp39955
      Universal Accessories by Hopkins®. When attaching a trailer to your vehicle, a premium quality wiring kit or harness is a vital necessity. An automotive trailer must have a reliable connection with the signaling system of your car...
      Splice onto tow vehicle's wiring systemCorrosion resistant terminals
      $2.03 - $371.45
    • (0 reviews)
      # sp62717
      Universal Trailer Wiring Installation Kit by Hopkins®. Everything needed to rewire a trailer.
      Ideal for Y-Harness and 4 conductor wire installationResealable storage case keeps items secure and organized
      $11.41 - $19.19
    • (0 reviews)
      # sp62714
      Universal Endurance Flex-Coil™ 7 RV Blade Adapter by Hopkins®. When attaching a trailer to your vehicle, a premium quality wiring kit or harness is a vital necessity. An automotive trailer must have a reliable connection with the...
      Splice onto tow vehicle's wiring systemCorrosion resistant terminals
      $25.25 - $63.50
    • (1 review)
      # sp4009
      Trailer Wire Installation Kit 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...
      Connects Electric System From RV to Veh in as little as 15 minDesigned to safely and efficiently haul your loads
      $177.54 - $193.51
    • (0 reviews)
      # sp46949
      Wiring Components by Tekonsha®. Look to CARiD for all of your trailering/towing accessories and replacement parts.
      No Cutting Or Splicing Vehicle WiringIsolates Trailer Light Operation from Tow Vehicle's Electrical System
      $95.33
    • (0 reviews)
      # sp78358
      Universal Trailer Tester by Tekonsha®. Testing device designed to assist in determining whether a tow vehicles trailer connector has been wired properly. Excellent diagnostic tool for installation, setup and troubleshooting of...
      Assists in installing and troubleshooting wiringFor use with leveling and pre-setting brake control when trailer is not available
      $274.15
    • (2 reviews)
      # sp46946
      Universal Breakaway Kits by Tekonsha®. Trailers with electric brakes are required to have a breakaway system that applies the brakes in the unlikely possibility of coming loose from the tow vehicle at speed. These systems use a...
      Applies trailer brakes if the trailer comes unhitchedFor use on 1, 2 or 3 axle trailers equipped with electric brakes
      $2.11 - $45.54
    • (6 reviews)
      # sp48018
      2-4-5 Way Connectors by Wesbar®. 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
      $4.93
    • (0 reviews)
      # sp34861
      Universal Trailer Wire Adapter by Anzo®. Every Anzo USA product is backed by a One Year Warranty against manufacturer defects. With over three decades of professional manufacturing experience and with ISO 9002 and German T.U.V...
      Factory Spec Weather Tight ConnectionsPlug-N-Play Design
      $14.74 - $32.88
    • (3 reviews)
      # sp46948
      Universal Proportional Controllers by Tekonsha®. Unlike timed brake controls that deliver the same power under all braking conditions, Brake Controls use Proportional Technology that senses the type of braking event, and applies...
      Applies trailer brakesShortens stopping resistance
      $3.58 - $308.95
    • (0 reviews)
      # sp81563
      Universal W8 Series Proportional Brake Control by Westin®. Westin's Receiver Hitches feature a round tube design, with some applications featuring a square tube design based on specific allowances or limitations. All feature a...
      Unique delta cut safety chain loopsWelded stylized forged steel collar
      $2.88 - $66.24
    • (2 reviews)
      # sp23027
      5th Wheel Hitches Accessories 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...
      Industry standard rail system for interchangeabilityTrailer weight ratings to 24000 lbs
      $48.98 - $152.56
    • (0 reviews)
      # sp64638
      Universal Billet Wire Plug Connector by Keep It Clean®. "The Plug" from Keep It Clean Wiring Accessories allows you to connect and disconnect your entire harness in seconds. This advance wire management system allows you to...
      High quality at an affordable priceExpertly made from premium materials
      $71.20 - $85.45
    • (0 reviews)
      # sp58624
      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...
      Expertly crafted from premium materialsDesigned to match rigorous quality standards
      $52.08
    • (0 reviews)
      # sp74365
      Universal Wire Connectors with Trailer and Vehicle Ends by Roadmaster®. Transform your vehicle into a reliable load-hauling machine by installing this superior trailer hitch. With this product that is made utilizing only the...
      Designed to safely and efficiently haul your loadsMade from the highest quality materials
      $9.67 - $21.49
    • (0 reviews)
      # mpn1043639
      T-Connector (56081) by CURT®. For Models without Factory Tow Package, 3-wire, Location: P3/P4. This provides all you need to connect a trailer to the tow vehicle. Generous length allows plenty of wire. Female end is for tow...
      Plugs into vehicle tail light assembly to provide a 4-way flat socketSimple plug-and-play design eliminates the need for cutting or splicing
      $36.12
    • (0 reviews)
      # mpn1044285
      T-Connector (55432) by CURT®. For Models without Factory Tow Package, 2-wire, Location: P1/P2. This provides all you need to connect a trailer to the tow vehicle. Generous length allows plenty of wire. Female end is for tow...
      Plugs into vehicle tail light assembly to provide a 4-way flat socketSimple plug-and-play design eliminates the need for cutting or splicing
      $20.12
    • (0 reviews)
      # mpn1900893874
      T-Connector (56269) by CURT®. For Models without Factory Tow Package, Location: P1/P2. 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...
      Plugs into vehicle tail light assembly to provide a 4-way flat socketSimple plug-and-play design eliminates the need for cutting or splicing
      $42.44
    • (0 reviews)
      # mpn1067438
      T-Connector (55349) by CURT®. For Models without Factory Tow Package, 3-wire, Location: S3/S4. This provides all you need to connect a trailer to the tow vehicle. Generous length allows plenty of wire. Female end is for tow...
      Plugs into vehicle tail light assembly to provide a 4-way flat socketSimple plug-and-play design eliminates the need for cutting or splicing
      $40.79
    • (0 reviews)
      # mpn539717915
      T-Connector (56283) by CURT®. For Models without Factory Tow Package, Location: P3/P4. 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...
      Plugs into vehicle tail light assembly to provide a 4-way flat socketSimple plug-and-play design eliminates the need for cutting or splicing
      $43.05
    • (0 reviews)
      # mpn1064510
      T-Connector 3-Wire System with Powered Converter by CURT®. For Models without Factory Tow Package, For Models without Tow Plug, 3-wire, Location: P3/P4. This provides all you need to connect a trailer to the tow vehicle. Generous...
      Plugs into vehicle tail light assembly to provide a 4-way flat socketSimple plug-and-play design eliminates the need for cutting or splicing
      $36.36
    • (0 reviews)
      # mpn201299587
      T-Connector (56264) by CURT®. For Models without Factory Tow Package, Location: P3/P4. 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...
      Plugs into vehicle tail light assembly to provide a 4-way flat socketSimple plug-and-play design eliminates the need for cutting or splicing
      $34.64




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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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    Trailer Hitch Wiring
    Came with clear installation instructions. The install was quick. Works great.
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    2007 Honda Ridgeline
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