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Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # C55513
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Custom Fit Vehicle Wiring

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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required. Converter is made using SMT to ensure superior performance. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C55513 or order online at Free expert support on all CURT products. Guaranteed Lowest Price and Fastest Shipping for Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (264)
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CURT Custom Fit Vehicle Wiring - C55513

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Converter
  • CURT

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required. Converter is made using SMT to ensure superior performance.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection points at the rear of your truck
    • Plug in T-connector
  • Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
  • Constructed using surface-mount technology (SMT) for consistent, reliable performance
    • Maximizes trailer light yield and intensity while producing minimal heat
    • Ensures superior operation in rough road conditions
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 3 amps per circuit
    • Tail lights: 5 amps per circuit
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located either behind the driver's-side and passenger's-side tail light assemblies or behind the rear bumper along the frame rail.

Once installation is complete, the 4-way connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.

Tail Light Converter with Surface-Mount Technology

A tail light converter is built into this T-connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of the trailer. This converter combines the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.

Curt builds each tail light converter using surface-mount technology (SMT). This method of construction involves soldering electronic components directly to the surface of a printed circuit board. SMT eliminates the need for leads, which are used in older through-hole technology. The result is a circuit board that is smaller yet provides more routing area and that offers superior performance, reliability and durability.

Curt SMT Circuit Boards

Circuit boards constructed using SMT have been shown to perform better under rough conditions with excessive vibration than those made using the through-hole method. And where would vibration be more likely to occur than in towing applications? Curt converters also produce less heat, leading to increased durability and longer life. In addition, lower levels of resistance ensure better performance, especially for parts that operate at higher frequencies.

Each Curt circuit board is made using high-quality components that are pieced together in the most technologically savvy fashion, leading to greater predictability and reliability in functioning.

55513 CURT T-Connector - Surface Mount Technology - 4 Wire

Installation Details C55513 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C55513

Average Customer Rating:  4.9 out of 5 stars   (264 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required. Converter is made using SMT to ensure superior performance.

2015 Toyota Tacoma

Wire length was perfect . Plenty of slack . The directions are inside the package and are simple . Vague on a few little parts but if you search out the answers it’s simple . The lights on my truck worked after installing just as they did prior to the job and I will test the u it tomorrow when my tester arrives , or if I just back up to my boat . I loved the included zip ties to get the wires neat , and the whip is long enough to put literally anywhere . I’d buy this again for sure . The connectors snapped in solid as I would expect for a quality product . So far a great purchase .

This product failed and it was a pain in the ass to get it all worked out as far as the warranty thing goes … understandable since people scam all the time but man , I wasn’t too happy about the process . The new one works fine and has worked fine and I will for sure be getting a backup unit so if it fails while I’m on the road I’m not stranded because of an easy to fix plug and play part . It was easy to install for me … it seems to be working great at this point and I take my trailer for a drive a few times a month to keep it all working .
Scott - 01/03/2022

2012 Toyota Tacoma

Installed the hitch on my 2012 Toyota Tacoma today. Will tackle the lights tomorrow. It went well although I could have used an extra set of hands I got it done. If a 59 yo can do it my themselves in 95 degree heat in a couple hours anyone can.

2007 Toyota Tacoma

That's my kind of wiring. I shopped around for installing trailer wiring. Prices were as high as $100. ! This kit for my Toyota Tacoma cost $35. I loosened four bolts, drilled in a ground screw. Plug and pull wire and done. I was able to pull the wired to the far side throughout the hollow receiver hitch. Didn't even need the zip ties. Great company. Thanks


The installation is very simple and straightforward, I would definitely recommend using the T-connector harness. It keeps everything nice and neat, and you know everything is going to work


The products installed just as stated. Everything went together easily and smoothly, even in the unpaved driveway. Thanks.


Wiring has substantial insulation for long wear.


excellent works as its supposed to, easy installation

howard a - 12/17/2021


Everything as advertised. Wiring kit had all the right factory compatible connectors. Installation was a snap (no pun intended).

2008 Toyota Tacoma

Item as described. Excellent quality. Super fast shipping. Way faster than [online] is currently.


2007 Toyota Tacoma
Worked perfect-plenty
of wire length for the right side tail light and the 4 pole connector to be mounted.


Fast delivery, great prices,best place to shop for your trailer related equipment

Working great,recommend etrailer to everyone
Thomas R - 09/29/2021


Electrical harness was very easy to install. Watched one of your videos and was very actuate easy to understand.


I have ordered this product before and works great but I wish they made them water proof this is my second one in Five years . The product works better than some others I’ve tried in the past


A super straightforward way to add trailer wiring to my truck. Great product at a great price.

Works flawlessly!
Barry - 07/09/2021


Easy as hell !!


The products that I purchased from you were exactly what you advertised,it was shipped promptly and packaged professsionaly. The trailer hitch went on perfectly, easily, it looks and works great. The wiring harness was the same way. I just watched your video that you have online and followed the instructions. I had no problems what so ever. The video"s were the biggest help. I would without a doubt buy for you people again. Thank you very much! P.S. I would send pictures but we are having a blizzard right now.


It was very easy to instal would recommend to everyone


Very easy to install and worked great. Staff was knowledgeable and friendly. I was told I would get it in about seven days got it in four days. I will.use this company for all my wiring needs. Thank you!

2013 Toyota Tacoma

I purchased a wiring harness a year ago for my 2013 Toyota Tacoma Pickup to haul my utility trailer. The installation instructions were very simple and clear. I installed the harness within an hour without any problems. It's working great when I need it and would recommend this product and any other from Etrailer. I have purchased many items from Etrailer thru the years and find the videos and other instructions very helpful with the installation. Great prices, great products and above all great support!

its still working great. No issues at all
Gary L - 10/21/2017


It looks like the old one that corroded! Will fit well have not install it yet

Theodore - 10/28/2021


Very easy to install. Connections felt solid. Good instructions


Excellent product. I installed trailer hitch and trailer wiring harness by myself 2.25 hours. Etrailer 1st class. Fast shipping. No complaints at all.

Excellent. Moved from Georgia to SC with truck pulling UHaul. Did Great!
John J - 04/03/2015

2006 Toyota Tacoma

Unlike IKEA furniture, this is a walk in the park to put together/install. Would recommend that you get a roll of the flexible black plastic wiring conduit to match that on the vehicle. It makes the job look more professional. Didn’t need extra zip ties, there is enough in the kit!! It worked first time!
Thanks etrailer for a good product.


Love it thank you


Had the product for a year now. Easy install and works great!

Show More Reviews

Ask the Experts about this CURT Custom Fit Vehicle Wiring

  • 4-Way Recommendation for 2015 Tacoma with 7-Way
    For what you are wanting to do the # C55513 will work. It installs by plugging inline with the factory taillight connectors of your 2015 Toyota Tacoma and will give you a 4-way that you can then use for your LED light bar. It's only listed as for "vehicles without a 7-way" because typically if you had a 7-way this wouldn't be the solution you'd be looking for. Since this bypasses all of the factory trailer wiring of your vehicle it will install and work great.
    view full answer...
  • Trailer Lights Don't Work When Headlights are On
    The problem you are having is a classic ground issue. If the ground wire to the trailer frame or the tail light grounds are not connected securely to clean, rust and paint free surfaces then when the headlights are turned the extra amperage draw for the running lights will cause all sorts of lighting issues. I would start by removing the ground wire at the trailer coupler and cleaning up the connection point and re-securing it to the trailer frame. Next I would check the ground connection...
    view full answer...
  • Troubleshooting Lights Dimming When Brakes are Applied with Trailer Connected 2012 Toyota Tacoma
    There are a couple issues you may be having. You may have a bad ground or short on your trailer wiring and when you hit the brakes the short causes an excessive drain on your vehicle battery and your lights dim. If you see the voltmeter on your dash dive when this happens then you know this is happening. You could have a weak battery or alternator, around here you can have those things tested at local car part stores. You may also just have too many lights on your trailer and there is...
    view full answer...
  • Comparing Tow Ready 118496 & Curt C55513 4-Pole Trailer Wiring Harnesses for 2010 Toyota Tacoma
    The only significant difference between the two is the rated maximum current output on each of the circuits. Tow Ready 118496 can provide up to 2.1-amps for each of the stop/turn circuits and 7.5-amps for the running light circuit. The Curt C55513 offers a 3-amp capacity for the stop/turn circuits and 5-amps for the running lights. The Tow Ready 4-Pole T-One Vehicle Wiring Harness # 118496 and the similar Curt T-Connector Vehicle Wiring Harness # C55513 are both confirmed fits for your...
    view full answer...
  • American Made Trailer Wiring Harness Recommendation for a 2006 Toyota Tacoma
    For a similar wiring harness that is made in the USA that has been confirmed to fit your 2006 Toyota Tacoma you would want the part # C55513.
    view full answer...
  • Can a Trailer with a 5-Way Attach to a Vehicle with a 4-Way
    A 5-way from a trailer will attach directly to a 4-way like what is on the part # C55513 that you referenced. The fifth pin will just hang off of the edge of the 4-way and wouldn't be active. If you are looking for an adapter to go from a 4-way on your vehicle to a 5-way you would need the part # 20036.
    view full answer...
  • Trailer Lights Wont Work with Headlights On
    When we have customers tell us that their trailer lights only work when the vehicle's headlights are off then this is usually a ground issue. Did you check both the trailer side and vehicle side connector? If not I would do this first and also, by check I mean you should remove each of them, sand down the surface and then reattach with new mounting hardware. A visual inspection of the ground terminal is not sufficient to check for function. The other potential cause is that the lights...
    view full answer...
  • Recommended Hitch and Wiring for a 2009 Toyota Tacoma Truck
    For the 2009 Toyota Tacoma, I recommend the Curt Trailer Hitch Receiver, # 13323. This hitch is designed to custom-fit both the standard Tacoma model and the X-Runner. This hitch is a Class III rated hitch and will have a 2x2 inch receiver hitch opening. Since your Tacoma was not wired with a towing package, then the Curt T-Connector Vehicle Wiring Harness, # C55513, is the wiring kit I recommend. This harness will connect to your vehicle using already existing wiring plugs located in...
    view full answer...
  • Trailer Wiring Recommendation for a 2011 Toyota Tacoma with LED Taillights
    Since you have LED taillights you are going to want to go with a trailer wiring harness that does not draw amperage from the actual taillight circuits unlike the # C55513. Since a custom wiring kit isn't available for your vehicle you would want the part # 119190KIT.
    view full answer...
  • Dash Lights Flashing with Turn Signals Using Curt Trailer Wiring harnes # C55513
    This sounds like a bad ground problem. Make sure that the wiring harness converter box is attached to a non-painted clean and corrosion free bare metal surface. Also make sure that the 4-Way on the vehicle and trailer sides are free of corrosion. To determine if there is something wrong in the converter box you will need a circuit tester like # PTW2979. You will need to test the wiring going into the converter first. If it is not correct then you know there is a problem with the vehicle...
    view full answer...
  • Trailer Hitch, Wiring & Related Towing Items for 2012 Toyota Tacoma
    Curt 2-inch Class III hitch # 13323 is a confirmed no-drill hitch fit for your 2012 Toyota Tacoma. This hitch fits both X-Runner and non-X-Runner versions and it includes the hardware you'll use for its bolt-on installation into the truck's existing frame weld nuts. An installation video is linked for you. For a 4-pole trailer wiring harness you can use Curt # C55513 which is a simple plug-and-play installation with no cutting or splicing of wires required, as shown in the linked video. You...
    view full answer...
  • Adding a 7-Way Trailer Connector and Brake Controller to a 2009 Toyota Tacoma with 4-Way
    Yes, you can use the 4- and 7-Way installation kit # ETBC7 with Curt trailer wiring harness # C55513 to install a brake controller on your 2009 Toyota Tacoma. I have included a couple of links that show and explain the ETBC7 installation for you. For a brake controller I recommend the P2 # 90885 because it is easy to set up and use and it is reliable.
    view full answer...
  • Using Optronics # TLL9RK Trailer Light Kit on Trailer Towed by 2005 Toyota Tacoma
    The # TLL9RK kit you mentioned is designed to be used to replace rear stop/turn/ taillights and the wiring on a small trailer. The kit features a 4-pole flat trailer connector designed for use with a 4-pole connector installed on a vehicle. If your Tacoma has a factory installed 4-pole connector, it should be converted already. If not, the Curt # C55513 trailer wiring harness would be a plug and play option that would plug inline with the factory connections behind the drivers and passenger...
    view full answer...
  • Hitch Recommendation for a 2015 Toyota Tacoma
    Yes, the Curt Hitch part # 13323 that you referenced has been confirmed to fit all models of the 2015 Toyota Tacoma so it would fit yours. I attached an install video for this product for you to check out as well. For trailer wiring you would want the part # C55513. For ball mounts I recommend the etrailer Ball Mount Kit # 989900. It comes with 2 ball mounts, 2 balls, a hitch pin with clip, and a carrying bag.
    view full answer...
  • Trailer Hitch Recommendation for a 2015 Toyota Tacoma
    Yes, the Curt Hitch part # 13323 that you referenced has been confirmed to fit your 2015 Toyota Tacoma so I would recommend it for you. I attached an install video for you to check out as well. If you plan on doing some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8 inch ball, 2 inch ball, hitch pin with clip, and a storage bag. If...
    view full answer...
  • Plug-In Trailer Brake Wiring Adapter For A 2007 Toyota Tacoma
    The Tekonsha Plug-In Wiring Adapter # 3040-P does not fit your 2007 Toyota Tacoma because this is for vehicles with the factory tow package. Your only option is to hardwire the harness with the Pigtail Wiring Harness for Tekonsha and Draw-Tite Trailer Brake Controller # 20127. You're also going to need to add a 4-way # C55513 and a 7-way # ETBC7 if one is not present. I have attached a couple of videos for you to check out as well.
    view full answer...
  • Troubleshooting 4-way Flashers on Trailer
    Most likely the problem is a weak ground on the trailer wiring. When your hazards are on all of the trailer and vehicle turn signals will be activated at the same time so a bad ground could prevent the lights from working. Check the condition of the grounds of each trailer light assembly and the condition of the main ground from the trailer wiring harness to the trailer frame. Make sure all grounds are made to a clean bare metal surface. Also check that the white ground wires on Curt 4-pole...
    view full answer...
  • Troubleshooting Trailer Lights Not Working Properly with New Lights and Wiring
    While it is very possible for the converter on a Curt T-Connector like part # C55513 or # C56513 for your 2008 Toyota Tacoma to go bad, it is important to do some troubleshooting before replacing parts because if the problem isn't the converter then you're out money and time spent on the new wiring harness. To determine if the converter on your T-Connector is bad or not you need to take a circuit tester like part # PTW2992 and start off by testing the connector for signals (see attached...
    view full answer...
    Image 1 for
  • Parts Needed to Install a Brake Controller and 7-Way in a 2013 Toyota Tacoma
    You are on the right track. To install a brake controller in your 2013 Toyota Tacoma will first require a 4-way like the part # C55513 and then the # ETBC7 to convert it to a 7-way so that you can install the # 90885 brake controller. There isn't an plug in adapter available for your truck. To prevent the trailer from draining your truck battery you can unplug the trailer connector or you can install an isolation solenoid like part # TR118665.
    view full answer...
  • How To Install a 7-Way Trailer Connector On a 2005 Toyota Tacoma
    In order to install a 7-way trailer wiring harness on your 2005 Toyota Tacoma you are going to need to combine the Curt T-Connector Vehicle Wiring Harness part # C55513 with the Universal Installation Kit for Trailer Brake Controller part # ETBC7. The reason you must combine two harnesses is because they don't offer singular 7-way trailer wiring harness for your 2005 Toyota Tacoma like they do for the newer models. The wiring is not present on your 2005 model for a plug in 7-way. That...
    view full answer...
  • Recommended Trailer Brake Controller for 2015 Toyota Tacoma Towing 13-Foot Scamp Trailer
    Our customers have told us again and again with their purchase decisions and product reviews that the Tekonsha Prodigy P2 trailer brake controller, part # 90885, is easy to set-up and operate and is supremely reliable. This is a superbly engineered brake controller that is a snap to use. Installation method will depend on whether or not your Tacoma has a factory-installed 7-way trailer connector at the rear bumper. If you do have a 7-way then installation will require only the controller...
    view full answer...
  • Trailer Hitch Recommendation for a 2009 Toyota Tacoma
    I have a much better solution for you than the Curt Hitch part # E-3S. You would want to go with a custom fit hitch instead like the part # 13323 as it will bolt directly to the frame and provide you with a much stonger and easier to install hitch than the # E-3S that would require you to use all 4 mouning holes. I attached an install video for you to check out as well. If you wanted to do some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts;...
    view full answer...
  • Will the Reese Multi-Tow 7-Way and 4-Way Trailer Connector Fit a 2012 Toyota Tacoma
    The Reese Custom Fit Replacement 7-Way and 4-Way Trailer Connector, # 74682, will fit your 2012 Toyota Tacoma if it came with a factory 7-way. This is a replacement for the OEM 7-way trailer connector for the Tacoma. If your Tacoma did not come with a factory installed 7-way trailer connector, then we will need to go a different route. If your truck does not have any trailer wiring installed, then you will first want to install a 4-way flat trailer connector. For this, I recommend the...
    view full answer...
  • What Parts Needed to Equip 2014 Toyota Tacoma to Tow Trailer With Electric Brakes
    The items needed to tow a trailer with electric brakes include the hitch, ball mount and hitch ball (that you already have), wiring harness, and brake controller with install kit. The linked articles on towing and brake controllers will give you some useful detail on these items and on towing techniques. For a hitch I suggest the Curt 2-inch Class III hitch # 13323; this will fit both X-Runner and non-X-Runner models. The installation instructions are attached along with a video and two...
    view full answer...

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Info for this part was:

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Expert Research:
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