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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 # C55243
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Quickly and easily install a 7-way, RV-style trailer connector on your vehicle with this custom harness. Connector plugs directly into OEM tow package port - no cutting, splicing or tapping required. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C55243 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 (133)
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  • Why etrailer?

CURT Custom Fit Vehicle Wiring - C55243

  • 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. Connector plugs directly into OEM tow package port - 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 point along frame rail
    • Plug in connector
  • Includes required relays to activate functions
  • Comes with protective cover for 7-way connector


  • Overall length: 30"
    • Wire loom length: 24"
  • 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 (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 plug on your automobile and the 7-pole connector itself - to help prevent corrosion.

55243 CURT T-Connector - OE Replacement 7-Way

Installation Details C55243 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 - C55243

Average Customer Rating:  4.9 out of 5 stars   (133 Customer Reviews)

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

2002 Ford F-250 Super Duty did a great job for me. I was trying to find a replacement for the 7-way bumper trailer outlet for my 2002 Ford F250. The first outlet would have fit, but there was damage in the last foot of the factory wiring harness I had to connect to. After several emails with Julie H. in customer service, Etrailer did the research necessary to find an alternate outlet that had the correct factory harness plug and provided new wiring back the the rail of the truck bed. Now Ive mounted this one on the tailgate post instead of the bumper which will protect it from the damage that ruined the original. Thank you again Julie!

2001 Ford F-350 Super Duty

Replaced a wore out and cut and spliced older connection with this new plug and play one. As usual etrailer hooked me up with exactly what I needed. From the pictures you can see the old one with a wiring nest and the new one looking good and doing good. The new one plugged right in and with the exception of having to use a couple of the old mounting bolts it looks perfect. I’m really happy with this purchase as I have been with my other etrailer purchases.


Easy to install truck wiring harness. Plug and play and done. Strong springs on the harness plug door that hold the trailer plug in very well too.

Great. Its still functioning perfectly.
Shawn - 09/11/2021
Great. Its still functioning perfectly.
Shawn - 09/11/2021

2000 Ford F-250 and F-350 Super Duty

These harnesses are great have had a hard time finding ones with factory ends on them. These guys had just what i was looking for piece of cake to install just route wires mount and plug in very clean install


Everything fit together with the factory wiring harness! No splicing of wires great!!

1999 Ford F-250 and F-350 Super Duty

There were not many options available for what I was lookin king for. Older vehicle and looking for a plug and play plug. Included was a harness (which will plug into the newer style plug) and the relays + fuses (which I did not need). There was not a mount and the plugs base had a different layout of holes than my existing mount. This product should work and is what was described but not exactly what I needed.

Working well
Eric - 08/28/2019


I purchased the Curt Triflex C51440 controller, C51322 adapter, and C55243 wiring harness together to correct the hacked up wiring that was on my 2000 F250SD after having intermittent brake issues on my 18' trailer. Due to the slipshod nature of the wiring that was on the truck, I felt it wise to start fresh. After cutting out all of the spliced in mess, installing the Triflex unit was extremely simple and made for a clean install. The C55243 harness was a simple plug and play. Keep in mind the harness does not include a bracket to mount the 7 way plug to the bumper (I already had one, you may not). The most difficult part of the install (after removing the old stuff) was finding the auxiliary distribution block to install the relays in. This varies by year, make, model and a little searching on the Google resulted in a few helpful photos/diagrams. The products seem to be good quality, shipping was prompt, and I received a follow up email from etrailer to confirm that my product had arrived and my needs had been met. Very impressed to this point. I have not towed with the setup yet, but the brake controller indicator display indicates everything is functioning correctly.


Used this in concert with HM40950 and it works great on my custom flatbed


It worked just like I hoped it would, it's a direct plug in to the OEM harness and it looks good too!

So far so good, everything works just like its supposed to.
CLB - 03/13/2015


I ordered a new wire harness and electric brake controller from trailer and was extremely pleased with the product and the level of service I received. I ordered it on a Sunday regular mail and hot an email 2 days later letting me know they upgraded mail delivery from 5 to 7 days to 5 day delivery no charge. I have 2 horse trailer's and have lots of friends who have the same and have recommend this site. I am also impressed with the wire diagram's and videos.keep it up guys your doing awesome.


Works great and easy to install!


Removed old plug unit from back bumper, replacement unit fit to exact existing screw holes. Harness was just an unplug and plug in for the new unit.
Took me less than 30 min to replace the old 7-pin plug. I regret not getting the 4-pin plug in option that was available,, factory wired in with the Harness


Good product. Instructions were a little off, but I attribute that to not being vehicle-specific. Still quite pleased with the purchase. Actually, I'm pretty pleased with the whole company!


The original part I ordered was the wrong part (my mistake). I emailed customer service and Phyllis helped me find the correct plug and expedited my shipping so I could get the part before I left for my trip. Etrailer was great to work with and Phyllis was extremely helpful in getting me the right part.


I do a lot of product reviews. If at any time in the future you want a product review, just let me know, and you can send me a product to try and write a review. It is sort of a hobby of mind. I love doing reviews, and trying new products. Just in case you are interested, my address is:

Jerry W Mann
Product review
12900 Raleigh Road
Benson, NC 27504-6812

(919) 749-5290

The Wiring Harness that you sent to me is of great quality. Actually better than OEM. The wires are of a heavier gauge, and the plug fits like a charm. Everything works as it should with no issues what so ever. Thanks for having a great product.

2001 Ford F-250 and F-350 Super Duty

Worked Flawlessly, Everyone Said I Could Only Get at Ford, Thank you Much, MCSpittle

Still going great
mark c - 05/16/2021


Arrived on time. Product exactly what I ordered. Will order from them again.


Easy installation and factory connection is the way to go. Now all my trailers have the same connector whether goose neck or bumper pull.

2000 Ford F-250 and F-350 Super Duty

Received my new brake 7-way plug and harness in 2-days. Kit came with (2) 30 amp fuses and (2) relays which I did not expect. Very pleased with etrailer. I needed and anode for my 5TH wheel and did not realize they stock this item as well. I will use etrailer again in the future!!!

2003 Ford F-250 Super Duty

just like in the picture, even though it was not listed for my 2003 f250 had to take a chance, the ones listed for my truck had a round pig tail connector that would not have worked, took a while to get it due to not having my complete order,very good product, the fuses and relays didn't need my truck was already set up,


Works great! However, it does NOT include the bracket if you need to mount it to your drop down hitch, unlike a few of the other brands out there.

1999 Ford F-250 and F-350 Super Duty

Great product. Would have liked some extra slack aside from what came with. I cut and put junction box under box on frame. Feeding gooseneck, headache rack, and bumper 7/4 way. Works as described.


This Harness was easy to install and plugged right into the factory harness on the truck without any problems.

Everything works as intended.


Thank all of you from customer service to delivery. Quality products, quality service, and the prices were great. Ford wanted twice the price for the T-connector and over $60 for a $4 bracket. I'll be sure to order from your site in the future. Thanks!

Saturn Relay

Just what I needed. Plug right into the harness. Took about 15-20 minutes to install with locating fuse and relay locations.

Show More Reviews

Ask the Experts about this CURT Custom Fit Vehicle Wiring

  • Replacement 7-Way Connector for 2000 Ford F-250 Super Duty
    If your 2000 Ford F-250 Super Duty came with a factory 4-Way, then the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package # C55243 referenced in your question is indeed the correct harness to install a 7-Way. The wiring from the back of the trailer connector to the port that will connect to your truck is not currently available as a separate item. This kit will include the 7-Way trailer connector. This will plug right into the factory wiring harness located beneath the rear...
    view full answer...
  • Troubleshooting Ground Wire of Trailer 7-Way Wanting to Pull Out
    I'd have to see what type of connection your 7-way makes, but if it's a set screw you'll want to make sure you are getting plenty of wire into the slot and then tighten it down so that it can't easily slip out. Also make sure you don't have trailer wiring that's just too short and wants to pull itself out when you make tight turns as the cable starts pulling.
    view full answer...
  • Where Does Curt T-Connector Vehicle Wiring Harness Install on a 1999 Ford Super Duty
    T-Connector is a generic term that is applied to any trailer wiring harness that is plug and play. Models of the 1999 Ford Super Duty that came with a factory 4-Way would use the connector # C55243 to just plug in where the 4-Way plugs in.
    view full answer...
  • 7-Way OEM Replacement Trailer Wiring Harness for a 1999 Ford F-250 Super Duty
    You can use the Curt T-Connector Wiring Harness, # C55243, or the Tow Ready Replacement 7-Way Harness, # 118243, on your 1999 Ford F-250 Super Duty. These are basically the same item for your truck made by different manufacturers. If the price point of the Curt harness is more appealing to you, then there is no reason why you cannot use that harness. There is one thing you will want to keep in mind when installing either of these harnesses, do not forget to install the relays and fuses....
    view full answer...
  • 6-Way Round to 7-Way Flat Recommendation for a 2000 Ford Expedition
    To go from a 6-way round on your tow vehicle to a 7-way blade you would want the Adapter 6 Pole to 7 Pole Trailer Wiring Adapter # 47435. With this adapter your brake controller will remain functional as the brake output circuit is on the adapter.
    view full answer...
  • Difference Between Curt and Tow Ready 7-Way Trailer Wiring for 1999 Ford F-250
    They are basically the same thing but are two different brands versions of 7-way trailer wiring for your 1999 Ford F-250. The part # C55243 is made by Curt and # 118243 is made by Tow Ready. Either would work great.
    view full answer...
  • Fifth Wheel 7-Way Recommendation for a 2016 Ford F-350 for Bed of Truck
    What I would actually recommend for you is the part # 41157. This is a harness designed for exactly what you are looking for. It will plug in line with the 7-way you have at the rear of your vehicle and will give you a second one for you to install up near the wheel well for the fifth wheel. I attached an install video for you to check out as well.
    view full answer...
  • Do I Need to Install Fuses and Relays on a 2000 Ford F-250 for Towing
    Yes, there are relays and fuses that will need to be installed on a 2000 Ford F-250 if not already present in order to activate the circuits for the brake controller and 7-way trailer connector. In order to check this you simply need take a look at the power distribution center. If there are fuses in both the Trailer Tow Electric Brake and Trailer Tow Battery slots as well as relays in both the Trailer Tow Backup Lamp Relay and the Trailer Tow Battery Charge Relay slots then you are good...
    view full answer...
  • Replacement 7-Way and 4-Way Connector for 2008 Ford F-450 With Factory Tow Package
    For a replacement wiring harness for your 2008 Ford F-450 with the factory tow package you need the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors # C55774. This will plug into your tow package wiring harness and give you a working 7-way and 4-flat.
    view full answer...
  • Will the Pollak 7- and 4-Pole Connector Plug Directly Into Factory Gray Plug on 1999 Ford F-250
    The Pollak 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket # HM40975 does not come with any wiring, just the socket and a mounting bracket. If the wiring on your 1999 Ford F-250 Super Duty is shot back to the factory square gray plug then you will need to use some replacement wiring. If you use the Curt T-Connector # C55243, it will give you the wiring that you need. You can then use the Pollak # HM40975 instead of the 7-Way socket that is provided with the Curt T-Connector package...
    view full answer...
  • No Power at 7-Way Charge Circuit On 1999 Ford F-250
    The relay box on your 1999 Ford F-250 is actually located in the engine compartment near the brake master cylinder. Since it sounds like you don't have power at the 7-way at all you probably need a new 30A fuse in location 16 for the trailer battery charge. The battery charge also has a relay in location 39. If you replace the fuses and still do not have power at the 7-way you most likely need to replace it. If the Ford has a factory tow package, you can replace the plug with part # C55774....
    view full answer...
  • Replacement 7-Way Connector for a 2004 Ford F-350 XLT Super Duty 6.0 Diesel
    I have a 7-way wiring harness for your 2004 Ford F-350 XLT Super Duty 6.0 Diesel but the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package item # C55243 you referenced fits the 1999-2001 F-350 Super Duty. If you are just looking for an OEM replacement 7-way you will want the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors item # C55774. This harness will replace your F-350's 7-Way and add a 4-way connector. It plugs directly...
    view full answer...
  • Available OEM Trailer Wiring Harness Kits for 1999 Ford F-250
    Hopkins Plug-In Simple Wiring Harness # HM40155 has a 4-pole flat trailer connector and is intended as a replacement for a factory 4-pole on your 1999 Ford F-250. We do have other wiring kits for your truck depending on how it was equipped from the factory; all kits are shown on the linked page. For example, parts # 118243 and # C55243 are 7-way kits that include fuses and relays to activate the additional circuits for the trailer.
    view full answer...
  • Adding 7-Way and 4-Way Connectors to a 2003 Ford F-250 with Factory Square Plug Behind Bumper
    We do have a solution for you that plugs into the square plug on the rear of your 2006 Ford F-250 but it will require 2 piece to get you to a 7-Way and 4-Way combine connector. Start off by installing the Hopkins Connector # HM40165. This has a 4-Way connector and a loose blue wire as well as a loose red wire. The next step is to install the Hopkins Adapter # 37185 which has a 7-Way and a 4-Way connector. The 4-Way on the adapter will connect to the 4-Way on the 40165 and then you simply...
    view full answer...
  • Availability of 7-Way/4-Way Combo that Fits 1999 Ford F-350
    Sounds like you are looking the intermediate harness that has a square connector on it like what that part # C55243 has. Since we don't a version of this with the # HM40975 you'd need both part numbers so you could use the HM40975 attached to the C55243.
    view full answer...
  • Replacement 7-Way for a 2002 Ford F-350, 450, and 550 Cab and Chassis
    The pin locations for the Curt T-Connector # C55243 are different from your connector because the 55243 fits a 1999 - 2001 Ford F-250 and F-350 Super Duty with factory 4-flat. Since you input your vehicle info as a 2002 Ford F-350, 450, and 550 Cab and Chassis the only replacement options we have look like the Curt # C55774 which plugs into the US Car Connector which would be on the other end of your wiring harness. If just the 7-Way on your vehicle is needing to be replaced then the 55774...
    view full answer...
  • Replacement 7-Way Trailer Connector For Rectangular Tow Package Connector on 1999 Ford F-350
    For the rectangular connector, you'll want to use the Curt # C55243 which includes the necessary fuses and relays to activate the tow package. The # C55243 doesn't include an integrated 4 pole connector like the # C55774 does, but you can use an adapter like # PK12716 from Pollak. I'm typically not super-enthused about using adapters, but Pollak currently makes the trailer connectors for every domestic pickup right now, and they build a great product so this should be very reliable for...
    view full answer...
  • Recommended Wiring Harness To Avoid Splicing on 1991 Toyota 4Runner
    We do have one option for a wiring harness that does not require splicing which is the ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit # 119250KIT. This uses zero-contact interface sensors to identify the current flowing through each wire by simply clamping onto the wire. This is typically used on vehicles with sensitive electrical components. Unfortunately, there is no plug and play option for a wiring harness like you described that...
    view full answer...
  • What Replacement 4-Way Fits My 2002 Ford F-250 with Factory Tow Package?
    Yes! If you need a new 4-way plug for your 2002 Ford F-250 with a factory tow package, we definitely have a plug that works for you. The correct harness you need is the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector # C55265. This is the same plug-and-play style connector as the # C55243. In order to make the mounting process easier with the Mounting Bracket 4-Pole Flat # 18144 and the No-Drill Long Bracket # 18136.
    view full answer...
  • What 7-Way Wiring Harness do I Need to Tow a Trailer on My 2019 Kia Sorrento?
    In order to prep your 2019 Kia Sorrento for a brake controller to use with your RV/trailer with electric brakes, you need the Universal Installation Kit for Trailer Brake Controller # ETBC7L. This harness splices in to your current wiring. As far as a great brake controller for your application, I recommend the Curt Echo # C51180. This controller is a proportional controller which means that it activates the trailer brakes in proportion to your vehicle's braking action. It also allows...
    view full answer...
  • Converting 4/6-Way Factory Connector on 1999 Ford F-350 SD to a 7-Way RV-Style Connector
    You identified the correct harness to convert your 1999 Ford F-350 SD from a 4/6-way trailer connector to the more common RV-style 7-way blade type. Part # C55243 will plug in to a square OEM connector along the driver's-side frame rail. You may want to use metal 7-way mounting bracket # PK12711U to simplify installation. The linked photo will show you the type of connector you are looking for under the frame.
    view full answer...
    Image 1 for
  • Adding a 7-Way Trailer Connector to a 2000 Ford Excursion
    The Curt trailer wiring harness # C55243 doesn't fit but I can recommend the parts to add a 7-Way trailer connector to your 2000 Ford Excursion. First, if the Excursion has a 4-Way flat connector now then you will just need # ETBC7 to add the 7-Way, keep the 4-Way, and have the wiring and accessories to wiring in a brake controller. If your Excursion does not have any trailer connector at all then you will first need to install a 4-Way using # 118344 and then you can install the ETBC7....
    view full answer...
  • Recommended 4-Way and 7-Way Trailer Connector for 1999 Ford Super Duty Truck
    To get the 7 way and the 4 flat on your 1999 Ford Super Duty truck, I recommend the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector # C55243. Then you will need to use the Hopkins Endurance Multi-Tow 7-Way RV and 4-Way Flat Trailer Connector - Vehicle End # HM40950 to get both functions readily accessible.
    view full answer...
  • Recommended 7-Way Trailer Wiring for 2000 Ford F-250 7.3 Diesel
    For your 2000 F-250 Diesel the trailer wiring you need depends on what your truck came with. If you have the factory 4-way then you would simply use the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector # C55243 to give you the functioning 7-way. You will also need a brake controller and harness if you want all the functions. I've linked the page to your options. If you didn't have the factory wiring at all, then you would instead use the 4-Pole...
    view full answer...

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