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  1. Custom Fit Vehicle Wiring
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  4. Trailer Hitch Wiring
  5. 7 Round - Blade
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Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector

Item # C55242
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Custom Fit Vehicle Wiring

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Quickly and easily install a 7-way, RV-style trailer connector on your vehicle with this custom harness. T-connector plugs directly into OEM tow package wiring harness - no cutting, splicing or tapping required. 1-833-496-1390 to order CURT custom fit vehicle wiring part number C55242 or order online at Free expert support on all CURT products. Guaranteed Lowest Price and Fastest Shipping for Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (73)
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  • Why etrailer?

CURT Custom Fit Vehicle Wiring - C55242

  • Custom Fit
  • Trailer Hitch Wiring
  • 7 Round - Blade
  • No Converter
  • CURT

Quickly and easily install a 7-way, RV-style trailer connector on your vehicle with this custom harness. T-connector plugs directly into OEM tow package wiring harness - no cutting, splicing or tapping required.


  • Provides a 7-way, blade-style trailer connector at the back of your vehicle to power your trailer's signal lights
    • Designed for use with a factory tow package
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection points along frame rail
    • Plug in T-connector
  • Includes required relays to activate functions
  • Comes with protective cover for 7-way connector
  • Limited 1-year warranty


This custom-fit T-connector plugs into your factory tow package wiring harness, which is located beneath the rear of your vehicle, along the driver's-side frame rail.

Once installation is complete, the 7-way connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (PK12711U - 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 7-pole connector itself - to help prevent corrosion.

55242 CURT T-Connector - OE Replacement 7-Way

Installation Details C55242 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector - C55242

Average Customer Rating:  4.8 out of 5 stars   (73 Customer Reviews)

Quickly and easily install a 7-way, RV-style trailer connector on your vehicle with this custom harness. T-connector plugs directly into OEM tow package wiring harness - no cutting, splicing or tapping required.


the harness i bought was a perfect fit and has been working as it is supposed to i was also happy with with the way i was treated and the time they took to answer all of my questions as i write this i am getting ready to order new tires and maybe wheels


Plug and play. What more can I say? It was a huge relief etrailer had a product in stock to prevent cutting my factory harness.

Awesome no issues after a year
Nicholas - 11/15/2020


This is a very easy wiring harness to install , now my trailer brakes work . Would definitely recommend , well worth the money.

2003 Ford F-150

plug and play was easy have not had it long enough to test durability but it seems to be a good item


Fast and informative response from customer service (Sheila C) Order shipped and received promptly. Easy plug into existing wiring, no cutting into exsisting wiring. Only negative would be the bracket for 7 way outlet not included, needs to be ordered separately. Would have been a fifteen minute job but I made my own bracket.

Product still working as expected. No issues.
JGM - 10/02/2018


It works . This is good, because if it failed within a year, you would have gotten some of that distasteful and spiteful language you don't like.

still working fine
Nick R - 10/11/2021

2001 Volkswagen Jetta

Very easy to install. Worked great until I traded in the truck 6 months later. I had an initial problem with the running lights but traced it down to a known but hard to find issue with the wire being pinched and shorted out at the wiring harness just outside of the fuse box on the left front wheel well. I am considering a motor home and will need a harness to connect my towed vehicle lights. I will definitely call for quote at that time. I will also need the front adapters to connect a 2001 VW Jetta to a Roadmaster tow bar.
Thanks for a great product and great service
Ken B

1999 Ford F-150

My 99 F-150 had both factory and after market harnesses installed. I was confused on what to order but took a chance with this one. It installed perfectly and worked perfectly. My original 7way had been cut off and the aftermarket had went bad due to corrosion.

Still working great. Thanks.
Ken - 06/12/2014


worked like a charm tested the lights and all worked perfectly.
same part from local Ford Dealer was 3 times the price.

Great product one year old still works like a charm
DaveB - 03/25/2015

2000 Ford F-150

Sorry for delay in the review.

wiring harness worked great, I had to do some playing with it due to the wiring issues with my old truck, but it worked as expected and perfect. I had to leave my old factory harness in place for this to work, as it has the factory 7 way, but I made it work. Thanks for the professional advice and help selecting the product.


The Curt T-Connector to add 7-way trailer connector to my truck installed quick and easy, and work just like expected. It would have been helpful if this product would have provided a bracket for mounting the connector.


Product received quicker than anticipated. Installation was simple and was able to remove all the previous owners messed up wiring and once the new part was installed everything worked perfectly.

Now when I connect my trailers up all the winches / lights work as expected.

The instructions were simple to understand and follow.

I book marked this site and will use again and also tell my friends.

Thanks etrailer

2002 Ford F-150

Easy to install, works great, allowing use of new boat with surge brake. Original 4 pin connector did not have back up light, this connector did not require tapping into reverse wire.


Direct fit. Would have gave 5 stars if would have deleted the old harness but it doesn't

No problems
Bryan - 11/10/2018

2002 Ford F-150

Thanks etrailer for your website. I had no clue what I needed for my recently purchased travel trailer. After a little research on your website and the great videos on the subject I found exactly what I needed to hook up the trailer brakes to my truck. Easy install and price was good. I am now looking to purchase tires to replace the ones on my camper. I will be sending another order soon. Thanks again etrailer!

Saturn Relay

I wish I knew that there was an issue with Ford 150 wiring harnesses. The wire under the electrical distribution box (under the hood, driver side) to the trailer running lights relay apparently gets pinched and over time shorts out. I was able to repair the short and get my trailer lights back in service. Thanks to the Ford 150 forum for helping me find this issue.

2002 Ford F-150



Everything I needed came in the box from etrailer and all I did was plug it up. It’s been working without any problems since I installed it a year ago. Awesome well built 7 way plug!


Good product only reason for 4 star is not due to the product it is do to than Ford E350 Van doesn’t have a good location to install the large plug. Ended up cutting a hole in the bumper to mount directly to the bumper.

Ford F-150

The pigtail matched perfectly with my oem wiring (2001 F150) and hookup was a breeze! Great product, good price and etrailer always knocks it out of the park with shipping service, well done!


Just received my order and installed over the weekend, everything went together like the videos showed and still waiting to put it all to good use. Jean at etrailers helped me with the questions I had and made things a little simple to decide which brake controller to get. She was a great help and I'm sure all off the employees are at etrailer. Thanks Jean


Easy to install (video helped); product well-built and seems like it will last a long time; If I had to suggest any improvement it would be to increase the size of the mounting screws; they are a little small to handle the push/pull forces of the plug/unplug operation. Otherwise, this is a perfect product for the application. NO wire splicing required!


The hitch looks really good and is built real heavy and sturdy. Can't wait to get it on. Wiring harness looks super easy to install. This will set it up to haul a trailer in as little time as possible. Great package.

2002 Ford F-150

If you have a need for a new plug to fit any kind of trailer these folks have what you need, I ordered 1 for my ford & its a plug & play install that would be the same as the factory installed with out the cost. Local dealers wanted $150 & I got it for about 1/3 the price

2003 Ford F-150

The wires plugged in perfectly. Kit provided the wrong 30 amp fuses, but my vehicle already had the fuses installed. The relays provided in the kit were spot on. 7 pin works perfect.

Show More Reviews

See what our Experts say about this CURT Custom Fit Vehicle Wiring

  • Troubleshooting Curt Wiring Harness # C55242 Harness Install Where the Connectors Don't Match
    Without knowing what vehicle you have it would be hard for me to verify for sure that the Curt Harness part # C55242 is the correct harness for your vehicle. I attached a picture that shows what the connector on your vehicle should look like. Maybe you just haven't found the correct connector to use. Here is a list of vehicles this harness is confirmed to fit: 2001 - 2003 Ford F-150 Flareside or SuperCrew with factory 4-flat connector 2000 - 2000 Ford F-150 Flareside with factory 4-flat...
    view full answer...
    Image 1 for
  • 7-Way Connection on 1998 Ford F-150
    The Curt T-Connector #C55242 is designed to plug in line of the connector that is in the drivers side frame rail near the rear bumper. You will undo the connection and plug the 2 connectors in line of that single plug. I have no idea what that 2nd round plug that you have goes into or is for as I have been unable to identify it. I have included a link below to the installation instructions PDF that shows a color picture of where the connection is and how the Curt connector plugs in line.
    view full answer...
  • Location of Fuses for Curt T-Connector Vehicle Wiring Harness on 2003 Ford F-150
    According to the installation instructions for the Curt T-Connector Vehicle Wiring Harness # C55242, the 30 amp maxi-fuses go in the Trailer Tow Electric Brake and Trailer Tow Battery Charge locations. These fuses are located under the hood in the power distribution fuse box. 101 is the Trailer Tow Battery Charge fuse and 108 is the Trailer Tow Electric Brake fuse.
    view full answer...
  • Replacement 7-Way and Wiring Harness Recommendation for a 2000 Ford F-150
    We had a customer with a similar problem and they were able to use the Curt Wiring harness part # C55242 and it worked just fine.
    view full answer...
    Image 1 for
  • Right Side Turn Signal/Brake Light Function Not Working on Curt Wiring Harness 55242 on 2002 F-150
    It sounds like the problem you are having with Curt trailer wiring harness # C55242 on your 2002 Ford F-150 could be a few different things. First, you said you checked the fuses. But did you also check the relays? It is possible that on your truck there are relays used to control the trailer left and right run/brake light functions. You would use the owners manual to find the locations. If all the relays are good and in place then it could be a wiring issue. If you unplug the Curt harness...
    view full answer...
  • Replacement 7-Way Trailer Connector and Wiring Harness for a 2002 Ford F-150
    To install a new 7-Way trailer connector and wiring harness on your 2002 Ford F-150 that came with factory connectors I recommend # 118242. This harness does come with new relays and fuses and I recommend installing them and keeping your old ones as spares that way we know the condition of all those parts. I have included a link to a video showing an example installation of this harness for you.
    view full answer...
  • Replacement 7-Way and Harness Recommendation for a 2000 Ford F-150
    Thanks for sending in the picture of the connector you have on your 2000 Ford F-150. All you would need to replace then is the part # 118242 for a new 7-way that would plug into the connector you have on your truck. This will include a few relays and fuses that you don't need, but this is the only way to get the parts you need from us.
    view full answer...
    Image 1 for
  • Installing a 7-Way Trailer Connector on a 2001 Ford F-150
    Your 2001 Ford F-150 likely came with a factory 4-Way and someone spliced in a 7-Way at some point. To determine if the truck is set up already for a fully functional 7-Way you can check under the hood to see if the necessary relays and fuses are present. If they are then you could use Curt harness # C55242 and it will work. If the fuses and relays are not present then they would also need to be added and I recommend harness # 118242 which includes them as well as the 7-Way. I have linked...
    view full answer...
  • 1998 Ford F150 4 Pin To 7 Pin Connector Upgrade
    The Ford Replacement OEM Tow Package Wiring Harness, 7-Way # 118242 will upgrade your factory 4-way connector to a 7-way. You will also want the mounting bracket # PK-12711U to position your 7-way connector in a convenient location and keep dirt and corrosion out. Included are both review and installation videos to help you get started.
    view full answer...
    Image 1 for
  • Replacement 7-Way Connector for 2004 Ford Explorer
    It does sound like the 7-Way connector on your 2004 Ford Explorer is in need of replacement. To do this, I recommend the Hopkins 7- and 4-Pole Trailer Connector Socket # HM40975. This trailer connector is confirmed to fit your 2004 Ford Explorer with the factory 7-Way connector. The socket will simply connect directly to the Explorer's OEM harness that you mentioned in your question to provide both a 7- and 4-Way connector at the rear of the vehicle. It also includes a mounting bracket...
    view full answer...
  • Would the 7-Way # HM40975 Install on the Harness of the Curt # C55242
    If you wanted to use the # HM40975 in place of the 7-way that comes with the part # C55242 that you referenced you could as they both use the same round connector. The # HM40975 would easily install on the harness of the # C55242.
    view full answer...
  • 7-Way Recommendation for 2001 Ford F-150 with Hardwired 7-Way
    Since your current 7-way was hardwired to the vehicle your best option is going to be a 7-way like the part # PK11898 which you can then wire in place of your current 7-way. Here are what the wire colors of this 7-way represent: Red - Left Turn and Stop White - Ground Blue - Electric Brakes Green - Right Turn and Stop Black - Battery Brown - Running Lamps Yellow - Backup Lamps
    view full answer...
  • Replacement Vehicle Wiring Harness For a 2003 Ford F-150 with 7-Way and 4-way Connectors
    To get the 7-way and 4-way combined connector you will need to use the Curt T-Connector Vehicle Wiring Harness # C55242 to replace the factory harness and then you will be able to use the 7- and 4-Pole Trailer Connector Socket # HM40975. This connector will replace the connector that comes with the Curt harness giving you both the 7-way blade connector and 4-way flat connector.
    view full answer...
  • Adding Trailer Wiring or Troubleshooting Only Running Lights Working on a 1997 Ford F-150 Connector
    To add a 4-Way trailer connector to your 1997 Ford F-150 you can use # C55344. This harness plugs in line with the tail light wiring on the truck. It will provide left turn/brake lights, running lights, and right turn/brake lights. I have included a link to the installation instructions for you. If you are having trouble with a 7-Way trailer connector then it is possible that there is a blown fuse or relay that is causing the problems. Use the vehicle owners manual and/or the legend on...
    view full answer...
  • 5th Wheel Trailer 7-Way Wiring Recommendation for 2017 Ram
    If you are looking for a 7-way harness to install in the bed of your 2017 Ram 1500 you'd want the part # 20110. If instead you are looking for a 4-way trailer wiring harness that installs by plugging inline with the 7-way you would want the part # C55384.
    view full answer...
  • Will 4-Way Trailer Connector on 2000 Ford F-150 Still Work After Installing Curt 7-Way # C55242
    The 4-Way trailer connector will still function once you install the Curt wiring harness and 7-Way connector # C55242. Please note that you may not require the use of all the fuses and relays included with the kit. Your truck may already have some of them in place. I have included a link to the installation instructions for you. I also recommend a mounting bracket for the 7-Way, # PK12711U.
    view full answer...
  • Recommended Trailer Wiring Harness for 1999 Ford F-150 or F-250 Light Duty Truck
    The Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector # C55242 will allow you to use the Mighty Cord 5th Wheel/Gooseneck Wiring Harness w/ 7-Pole Connector - 7' Long # A10-7007 to give you the connection at the bumper and another in the bed of your Ford truck. They will work together well and can be used independently or at the same time.
    view full answer...
  • Recommended Wiring harness for 2003 Ford F-150 and 2001 Ford F-250 Super Duty
    It sounds like you are looking for the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors # C55774 which is a confirmed fit for your Ford F-150. For your F-250 the only connection I see is the # 40167 with the long harness or the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package # C55242. Both only have the 7-way but can use the Hopkins Endurance Multi-Tow 7-Way RV and 4-Way Flat Trailer Connector # HM40950 to get both. If...
    view full answer...
  • Recommendations for Installing a 7-Way on a 2001 Ford Expedition
    Based on what you said it would appear as if the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package # C55242 would work on your 2001 Ford Expedition and I wish I could recommend it for you, but I checked with Curt and the Tow Ready and they said it would not. The only safe way I can recommend you install a 7-way on your vehicle would be to use a 7-way part # 37185. To install a brake controller like the Prodigy P2 Controller # 90885 you would still use the harness part # 3035-P...
    view full answer...
  • 7-way and Brake Controller Recommendation for a 1999 Ford F150 Styleside with 4-Way
    The two parts you referenced, the # 118242 and the # C55242 are both just two different manufacturers takes on basically the same product. Either would work just as well as the other for you. The only difference is the brand. For a brake controller the most popular option we carry is the P2 Brake Controller part # 90885 because of how easy it is to setup and how well it works. All you would need to install it would be the part # 3035-P. This will plug into the controller and then plug...
    view full answer...
  • What is the Correct Wiring Harness for a 2004 Ford F-150 With 4-Flat?
    I have the connector you'll need, but the Curt T-Connector # C55242 will not work with your 2004 Ford F-150 Lariat. Instead, you need the Tow Package Vehicle Wiring Harness # 118247, which is a confirmed fit for 2004 F-150's with a factory 4-flat. You will also want to use a mounting bracket such as # PK12711U with the harness. I have added a link to a video of this harness being installed on a 2004 F-150 for you to take a look at.
    view full answer...
  • How to Install Combination 4-Pole/7-Way Trailer Connector on 2007 Nissan Frontier
    You can install a combination 4-pole/7-way on your 2007 Nissan Frontier by first installing a 4-pole harness kit like # 118525 unless you already have one. Once you have a 4-pole you can simply plug in adapter part # 37185 if you only need the basic lighting signals from the 4-pole (but in both the 4-pole and the 7-way pin types). If you need the 7-way to be fully-functional with the additional circuits for trailer brakes, 12V power and reverse lights then instead use kit # ETBC7. This...
    view full answer...
  • Parts Needed to Add 7-Way Connector for Mobility Scooter Carrier on 2001 Ford Expedition
    We do have everything needed to add a 7-Way connector to your 2001 Ford Expedition, however the Curt T-Connector # C55242 that you referenced will not work. This harness is designed to plug into the factory ports on certain model Ford trucks and will not fit your Expedition. If you don't currently have any trailer connector on your vehicle then you will need to start with a 4-Way. For this the Tekonsha T-One # 118344 will work perfectly. It is a custom harness that will plug right into...
    view full answer...
  • Parts Needed to Add 7-Way and Brake Controller in 2001 Ford F-150 with Factory 4-Way
    To install a 7-way in your 2001 Ford F-150 the correct part you need is the part # C55242 that you referenced which will mount with the bracket part # PK12711U you also mentioned. To install the Curt Venturer part # C51110 you also mentioned will require the # C51322 which plugs in under the dash of your truck. Check out the install video I attached for more info on this as well.
    view full answer...

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