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Ford Replacement OEM Tow Package Wiring Harness, 7-Way (Super Duty)

Ford Replacement OEM Tow Package Wiring Harness, 7-Way (Super Duty)

Item # 118243
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Tow Ready 7 Round - Blade Custom Fit Vehicle Wiring - 118243
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Tow Ready Custom Fit Vehicle Wiring - 118243

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

Replacement OEM Tow Package 7-Way Wiring Harness for 99-01 SuperDuty Trucks with OEM 4-Flat Connector
  • Exact Replacement for Damaged OEM Wiring Harness
  • Installs in Seconds
  • Upgrades Vehicles From 4-Flat OEM Wiring to 7-Way Connectors
  • Connects Directly to Standard OEM Connector
  • Fuses and Relays Included

Product detail
Picture of 7-Way Connector.

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118243 Ford Replacement OEM Tow Package Wiring Harness, 7-Way (Super Duty)

Installation Details 118243 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Ford Replacement OEM Tow Package Wiring Harness, 7-Way (Super Duty) - 118243

Average Customer Rating:  4.8 out of 5 stars   (348 Customer Reviews)


I got this 7 way plug for my 99 f350 because the old one was corroded and didn't work properly. This unit was priced right arrived in a timely manner and was very simple to install. I just had to find where on the harness the old one plugged in and plug the new one in.

One year later and it has performed flawless!
John S - 11/08/2021

Ford F-250 Super Duty

I purchased the 90° 7-pole wiring harness for the bed of my F250 and the OEM replacement 7-pin harness for the rear bumper. I'm the 2nd owner and for a long time I left the plastic bed-liner in it. When I removed it recently I discovered there was a hole in the bedside from the previous owner. I use my truck to pull a fifth-wheel camper too, and the bumper wiring harness pretty much maxes out my trailer's pigtail. Both wiring harnesses were very easy to install, and I was even able to trim the spacer provided with the kit to fit the contour of the bed where the previous owner had drilled the hole. It looks like it came installed from the factory!

1999 Ford F-250 Super Duty

I have a 1999 F250 4x4 and wanted to upgrade from 6 round to 7 round to match the car trailer I had just bought. I had almost given up on finding a plug and play up grade and was preparing myself to start cutting wires. I'm so thankful that I found this web sight. They have a very large selection including the one that I needed. On top of that the video of how to install was spot on. I would not have thought of having to add a fuse and upgrade another under the hood.
They were very helpful, great turnaround time and great product. I will definitely buy from them again.


Well , first, I thought it was a ford replacement part , when it came in , not 1 but 2 of them serparate packages , then when I go to install, I see it’s not the double with regular plug also, so this part is useless for me. The one on my truck has 7 pin and 5 pin together. You can not take 7 pin out and switch with new one. Not sure why you sent two kits

You mentioned that you wanted to have a harness that would have both the 7- and 4-way connection. I am happy to see if we have what you are looking for. What is the year, make, and model of your truck? Did it come with a factory 7 way?
-- Etrailer Expert Jenny N - 06/22/2022
Yes ma’am, it came from Ford that way F-450 platinum, all options. Let me know if you carry the dual plug together,please
-- comment by: Gary - 06/22/2022
What is the year of your Ford?
-- Etrailer Expert Jenny N - 06/22/2022
2016 F-450 Platinum Dually
-- comment by: Gary - 06/22/2022
I looked at everything that we have for the 2016 Ford 450 Platinum Dually and we do not have a seven way to offer that also comes with the four way. I had wanted to offer part HM40975 as a solution because it works with the Ford 350 however it will not. I am guessing it is because the F 450 does not have the round US Carr connection. That is my best guess.
-- Etrailer Expert Jenny N - 06/22/2022


Plug and play good quality!

Still works great as the day I installed it make sure you use dielectric grease on your connections to ensure everything lasts a long time and to prevent corrosion
James - 03/04/2022

1999 Ford F-250 Super Duty

Attached are images of the installation in a 1999 Ford F250 Super Duty 4WD 4 Door 8' bed. I left the 4 prong connection mounted, and tied and bagged the connection for future use if needed.


The wiring harness fits exactly what I beeded and arrived on the exact ship date given. Great price and free shipping.

2001 Ford F-350 Super Duty

I have not received it yet … where did the driver say he left the package ?

I will have our customer service team reach out to you so that we can track it.
-- Etrailer Expert Jenny N - 06/17/2022


Excellent harness for my super duty. After using one year with multiple trailers it's still working great.


Awesome direct replacement fit . Plug and play replacement. I did have to drill a hole in my trucks mounting location as not all the holes lined up exactly but that was a minor inconvenience for the ease of replacement!

A year later its still working great
Don D - 06/29/2021


The parts fit exactly with the OM fittings and work perfectly thank you.


It worked great, I simply removed the old one and replaced it with yours and everything is working fine. Thank you.

1999 Ford F-250 and F-350 Super Duty

Product was need for a time sensitive job. Prompt fast service. Was delivered a day early. Quick easy hook-up. Completed the job and everyone was happy. I recommend this product.

1999 Ford F-350 Super Duty

I utilized this product on my 1999, Ford, F-350 Super Duty to replace the OEM factory harness and it worked exactly as promised. Within several minutes the installation was completed and I was ready to tow. e-trailer customer service is excellent!

Still works fine!
Ed G - 09/18/2015

2000 Ford F-250 Super Duty

Fits my 2000 F250 Superduty perfectly. I ordered this with the 7 and 4 pole trailer connector HM40975 since my boat trailer has the 4 pin. Too bad they don't sell the wire harness without the 7 pole if you go that route. Had to shim 3/4" for the bracket or the plug would be obstructed by the bumper. I'm very pleased with the result and service.

2000 Ford F-250 Super Duty

I bought the 118243 replacement 7 way trailer connector for my 2000 Ford F250 7.3 Super Duty. Hooked it up in less than an hour. I also needed the adapter bracket 11840. Without this bracket, the 118243 connector would not mount correctly to my truck. It would not clear the bottom of my bumper in the original mounting position on the bumper. I also bought the Pollak 7 plus 4 way connector because I have multiple trailers with different connectors. This product is HM40975 and I highly recommend that it be purchased with the other two products.

The guys at eTrailer really know their products and are so helpful. They know what exceptional customer service is all about. Also, I love all of their online videos and information on the website that allows you to make informed decisions. Their prices are very competitive too. With free shipping over $99, they can't be beat.. For those reasons, I will not buy trailer gear anywhere else.


Installed easily!! Plugged directly into my factory wiring harness. Worked perfectly.


Very happy with the direct plug in. All connections look like they are good and weather tight. Good rubber seal on the dust cover.

I really like the detailed tracking. Great follow up after the sale. I will be back again.


Exactly what I wanted.

2000 Ford F-350 Super Duty

Converted the dually Ford F350 to a flatbed and just needed the wiring to plug into the factory 4-flat connector on the pickup harness to the connector on the flatbed's installed 7-way/4-flat combination plug. Already had the fuses and relays from pulling gooseneck before, so it only took a couple of minutes to plug in the connectors and do a light check on the trailer. Everything worked perfectly. Thanks George!


Fit perfect, fraction of the cost the dealership wanted for oem replacement harness


Works perfectly. Used it to replace the original one in which the original owner had spliced wires into. Glad I got rid of the red neck wiring


Easy replacement, everything works again. Thanks. 01’ F250

1999 Ford F-250 and F-350 Super Duty

Plug in replacement that fits directly into factory harness.


Looked all over for this harness! All other places only had the fifth wheel harness to plug right in, then coil up the excess. Item arrived in good time and in original packaging, kudos to! The harness plugged right in and works as expected. This was for a 2002 Ford F250 SD, even though the item stated it might not fit. Unplugged the 6 pin and plugged this one in. Just in case anyone else orders this for their 02. I will be ordering more stuff in the future from, this was a work truck in its previous life...

Show More Reviews

Ask the Experts about this Tow Ready Custom Fit Vehicle Wiring

  • Location of Back Up Lamp and Battery Charge Relays in 1999 Ford F250 Super Duty
    In my research, I managed to download a copy of the Owners Manual for the 1999 F250 SD. I found that the Trailer Tow Back Up Lamp Relay is in position # 38 and the Battery Charge Relay is # 39. According to the diagram of the various locations in the power distribution box, location # 38 and 39 are not shown. The manual goes on to say that 38 and 39 are located in a smaller box that should be found adjacent to the larger box (closer to the brake master cylinder). I also found the same...
    view full answer...
  • How to Determine Where the Fuses and Relays of Ford Replacement Harness # 118243 install on F250
    You will need to locate the vehicles power distribution box and the trailer tow relay block attached to it. This is under the hood on the driver side. You will need to open the cover to access the fuses. The information for where the fuse locations are will be in the owners manual of your vehicle or even if there is a legend on the fuse box cover you can use that. You will be looking for the trailer tow electric brake and trailer tow battery fuse locations. For the relays you will be looking...
    view full answer...
  • Would the Ford Replacement 7-Way Harness # 118243 fit a 2000 Ford F-250 with Harness
    The Ford Replacement OEM Tow Package Wiring Harness # 118243 that you referenced is designed to work as a replacement for vehicles that came with a factory harness. So if you had a trailer wiring harness on there at one point and it got damaged you could simply just plug in the # 118243 and you would be ready to go. If your vehicle did come originally with a 4-way you would just need to install the two included fuses and it would be fully functional. This route would be much easier than...
    view full answer...
  • What is the Best Way to Check to See if a Relay is Bad on a 2008 Ford F-250
    The easiest way to check a relay is to pull the relay and then insert a new one. I would say that it is likely a relay issue since you stated you checked all the fuses already. Use the vehicle owners manual to find the locations of the relays related to the tow package wiring. Before you change out a relay and reconnect the trailer you will want to be sure to determine what caused the problem in the first place. A short on the trailer could have caused this issue and unless it is fixed...
    view full answer...
  • Where to Install the Relays and Fuses in a 2001 Ford F-250 to make the 7-Way Functional
    On your 2001 Ford F-250 Super Duty the two boxes in the engine compartment are the power distribution box (larger box) and the trailer tow relay block (smaller box) which is attached to it. Open the covers to access the relays and fuses. You will need to look in your owners manual and locate the Trailer Tow Electric Brake and Trailer Tow Battery Charge fuse locations and insert the 30 amp maxi-fuses (provided) into them. Also in the owners manual locate the Trailer Tow Backup Lamp Relay...
    view full answer...
  • No Power at Trailer Connector on a 1997 Ford F-250
    There may be a relay that is bad. Use the owners manual to find the relay locations related to the tow package wiring. To test a relay you basically have to take a known good relay and install it in place of the possible bad one. If the function starts to work then that was the issue. If the fuse and relay are both good but there is still no power getting to the fuse that indicates a problem with the truck wiring somewhere that will have to be checked out by a qualified mechanic or Ford...
    view full answer...
  • Troubleshooting Right and Left Turn Lights and Brake Lights Not Working on a 2003 Ford F-250 7-Way
    You have done a great job troubleshooting the problem so far and have isolated the issue to the truck wiring. I have confirmed with my contact at Tekonsha, and another fuse that you might check would be fuse # 6 in the under dash junction box. This is a fuse for the trailer towing light relay. This will be a 20 amp fuse. This sounds like this is the fuse that is most likely causing the issues on your 2003 Ford F-250, since you do not have either brake or turn signals. The # 6 fuse is...
    view full answer...
  • Troubleshooting a Weak Right Stop/Turn Signal Circuit in the Bed of a 2002 Ford Super Duty
    It very well could be a dirty connection or a short somewhere on the circuit. I would start at the back of the connector in the bed of your truck checking it for corrosion and then trace the circuit back checking for cut or exposed wire and fix as necessary. I do think its most likely corrosion either on the front of the connector, the back of the connector or where it connects to the 7-way at the bumper. I attached an FAQ article on trailer wiring that you might find informative also.
    view full answer...
  • What Relays Needed in 2001 Ford F-250 Super Duty V10 4x4 to Activate the 12V Circuit on 7-Way
    The relays you need to activate the 12V charging circuit for your 5th wheel are not offered separately at etrailer. These should be available from your local Ford dealer or auto parts store. There should be indications in your owners manual and/or labels on the relay boxes to indicate the location and type of relays required to activate your trailer charging circuit. The relays included in the part you referenced, TowReady Ford Replacement OEM Tow Package Wiring Harness # 118243, are...
    view full answer...
  • Running Lights Stopped Working on Horse Trailer Towed by a 2003 Ford F-350
    Running/tail lights are on the same circuit on your 2003 Ford F-350. The likely problem is a blown fuse or relay associated with the running light circuit. Use the truck owners manual to find all the locations of the fuses and relays used for the tow package wiring. Checking fuses is easy but to check a relay the easiest thing to do is to place a known working relay in place of a possible bad one. If the function then starts working then you know it was a relay. I have linked a help article...
    view full answer...
  • Where To Install Fuses and Relays From Tow Ready Wiring Harness # 118243 on 1999 Ford F-250 SD
    On your 1999 Ford F-250 Super Duty the two boxes in the engine compartment are the power distribution box (larger box) and the trailer tow relay block (smaller box) which is attached to it. Open the covers to access the relays and fuses. You will need to look in your owners manual and locate the Trailer Tow Electric Brake and Trailer Tow Battery Charge fuse locations and insert the 30 amp maxi-fuses (provided) into them. Also in the owners manual locate the Trailer Tow Backup Lamp Relay...
    view full answer...
  • Wiring Harness for 2000 Ford F-250 and F-350 Super Duty
    Yes, as long as your pickup does not have the factory Deep Drop Bumper, and has the factory 4-flat connector, this kit will upgrade your trailer wiring to the 7-way connector and the fuses and relays will activate the brake and accessory functions at the connector.
    view full answer...
  • Why do I need to replace the 7-way on my 1999 Ford F-350?
    The Ford Replacement OEM Tow Package Wiring Harness, item # 118243, upgrades your vehicle 4-flat OEM wiring to a 7-way connector to fit the plug on your trailer. It will also replace a damaged 7-way OEM wiring harness. So unless you either need to upgrade or replace your plug, you will not need this. To adjust a Voyager brake controller, you can make several slow stops around 25 mph, as if you are coming up to a stop sign, and take notice of how the trailer brakes respond. If the brakes...
    view full answer...
  • Where to Install the Relays that Come with Tow Package Wiring Harness # 118243 on a 1999 Ford F-250
    I went over those instructions for the Ford Replacement OEM Tow Package Wiring Harness, # 118243, and other than the statement that they are located in the Power Distribution box, you are correct; it does not state specifically where the relays need to go. The information should be in your 1999 Ford F-250 owners manual. I did a little research and found the locations. The Trailer Tow Backup Lamp Relay is position #38 in the power distribution box. The Trailer Tow Charge is position # 39...
    view full answer...
  • Trailer Left Turn Signal Stopped Working on a 2001 Ford F-250/F-350 Super Duty with Tow Package
    The relays and fuses that are included with the Ford Replacement OEM Tow Package Wiring Harness, # 118243, do not affect the turn signal functions but there could still be relays/fuses related to the tow package wiring that do affect the turn signals. What you can do is to check with the vehicle owners manual for all of the fuses and relays related to the tow package. You can then check those to determine if there is a problem and replace as needed. Otherwise, checking the wiring would...
    view full answer...
  • 12-Volt Accessory Power Feed on 2008 Ford F250 is Not Charging Travel Trailer Battery
    In order to activate the 12-volt accessory power feed to the 7-way, there is a fuse and a relay that need to be installed in the fuse box under the hood. Your owners manual or the legend on the fuse box lid will show you the correct location. If the accessory circuit once worked in the past, check for a blown fuse or a bad relay. If the fuse and relay are already in place and are not faulty, please get back with me and will will look into some other less likely possibilities. Keep in...
    view full answer...
  • No Power to Tow Package Fuses on a 1999 Ford F-250
    If there is no power to the tow package fuses then it either means that the relays associated with the tow package wiring are bad or missing or that the contacts in the power distribution box for those fuses are not present. The best way to test a relay is to use a known good one in place of a bad one. If the function starts working then you know that was the issue. We do not carry the relays by themselves so you would need to get them from a Ford dealer. Fuses and relays get fed power...
    view full answer...
  • Turn Signals Not Working in 7-Way Trailer Connector on a 2002 Ford F-350
    On a trailer, the turn signals are on the same circuits as the brake lights. On a 7-Way trailer connector they would be the pins in the 9 oclock and 3 oclock positions. If you are not getting turn signal functions on those two pins, but you are getting brake lights, then that does indicate a possible blown fuse. But since you said the fuse is fine there could be a relay somewhere. The easiest way to find the locations of fuses/relays is to use the truck owners manual. On many trucks there...
    view full answer...
  • Replacement Tow Package Wiring Harness for 2000 Ford F-250 Super Duty
    The Tow Ready Replacement OEM Tow Package Wiring Harness # 118243 can absolutely be used to replace the 7-way harness on your 2000 Ford F-250 Super Duty, as long as the square connector under your vehicle has not been damaged. The harness can be quickly installed by simply connecting it directly to the OEM connector under your vehicle. I have included the installation details for your review.
    view full answer...
  • Solution for Replacement Trailer 7-Way Harness Recommendation for 2000 Ford F-250
    I wish we had just the harness but the best we can do is the part # 118243 which also comes with a new 7-way and a couple fuses and relays. Most likely this will cost less than getting the harness from a Ford dealer and it comes with some spare parts so it might still be an option for you to consider. This does not have a 4-way included.
    view full answer...
  • Trailer Wiring Harness Recommendation for 1999 Ford F-250
    For your 1999 Ford F-250 the correct 7-way trailer wiring harness you would want is the # 118243 which is a confirmed fit. I attached an install video for you to check out as well that shows this installing in a 1999 F-250 just like yours.
    view full answer...
  • Solution for Needing Just Harness of Ford OEM Tow Package Wiring Harness 118243
    The only way we offer a way to get the intermediate harness of the Ford Replacement OEM Tow Package Wiring Harness # 118243 is with the entire kit. I wish we had just the part you need but we do not. At least with this you'd have a backup 7-way, fuses, and relays. Other option might be to contact a Ford dealer.
    view full answer...
  • Parts Recommendation to Upgrade 4-Way of 1999 Ford Truck to 7-Way
    Yes, the Tow Ready Custom Fit Vehicle Wiring # 118243 is exactly what you need to convert the 4-way on your 1999 Ford truck to a 7-way and comes with everything needed.
    view full answer...
  • Where do Trailer Battery Charge and Back Up Lamp Relays Install on a 1999 Ford F-250 Super Duty
    I checked an online copy of the owners manual for a 1999 Ford F-250 Super Duty to find the locations for the fuses/relays related to the tow package wiring. In the in-cab fuse panel there are fuse locations at 13, 24, and 28. Under the hood in the power distribution box there are fuse locations at 1, 3, 4, 8, 16, and 28. And the trailer backup lamp relay is location 38. That leaves the trailer battery charge relay in location 39.
    view full answer...

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