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  5. 7 Round - Blade
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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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Custom Fit Vehicle Wiring

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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   (366 Customer Reviews)


Right part right plug on both end . 1 st pick is old harness 2nd is new harness. 3 rd is howl will use it .


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

2001 Ford F250 wiring tow harness was a perfect fit. Plug n play.


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

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.

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.


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

2000 Ford F-250 and F-350 Super Duty

Just what was needed, thanks

After a full year the new trailer wiring we bought for our Ford F350 is still working perfectly. Very happy.
Meri - 08/21/2022

1999 Ford F-350 Super Duty

Everything fit as expected great company to do business with.


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

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.


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

2001 Ford F-250 Super Duty

The chat option is super helpful and they got me the correct parts for my 01 F250.

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


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

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

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.

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-350 Super Duty

Fit perfectly, super fast install. Thanks so much!

1999 Ford F-250 and F-350 Super Duty

So I was led to this website while shopping online for the wiring harness that I needed. I mistakenly ordered the wrong part and immediately called etrailer with my error. I spoke with a gentleman named Laser who immediately corrected my mistake and actually shipped the correct harness while I was on the phone. Because it was actually less than other online sites even with shipping. Thanks guys


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.


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.


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

Show More Reviews

See what our Experts say about this Tow Ready Custom Fit Vehicle Wiring

  • 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...
  • Will the Ford Replacement OEM Tow Package Wiring Harness Provide a Fully Functional 7-Way
    Yes, if you install this Ford Replacement OEM Tow Package Wiring Harness # 118243 it will be fully functional and would work to operate the lockout solenoid of your 1999 Ford Super Duty. You will need to install the included relays and fuses to complete all the circuits. Check out the installation instructions I attached for this product.
    view full answer...
  • 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 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...
  • Troubleshooting Tow Ready Custom Fit Vehicle Wiring, # 118243 Not Working on a 2001 Ford Super Duty
    If you are not getting any power or signals, or limited signals to the 7-Way on the Tow Ready Custom Fit Vehicle Wiring, # 118243, then the problem could be with the fuses and/or relays that came with it. If not installed, they will need to be. If the truck already had some and you did not replace the factory ones with the replacements, the old ones may be bad and need to be replaced. According to the installation details, which I have linked for reference, you will need to consult your...
    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...
  • 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...
  • 7-Way Recommendation for a 2001 Ford Super Duty with Square Connector Harness
    The best option we can provide would be the 7-way part # 118243 that will plug into that square connector you have on your vehicle and will give you a fully functional 7-way once you install the relays and fuses that are included.
    view full answer...
  • Only Running Light Circuit Works on 1999 Ford Expedition 7-Way Trailer Connector
    The problem that you have with the 7-Way on your 1999 Ford Expedition could be a dirty or corroded trailer connector. Make sure that the connector is clean and free of corrosion inside, where the wires attach, and outside on the pins themselves. Also check for loose or damaged wires and fix as needed. If you still have problems then it could be a fuse or relay related to the tow package wiring. There are several on your Expedition: In-cab fuse box: Location 23 for trailer tow battery...
    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...
  • Blower Fan for Heater/AC is Not Working, Do All Relays and Fuses have to be In Place for It to Work
    Relays control specific functions so if one is not in place or blown then only the functions associated with it would not work. What I recommend is to consult the vehicle owners manual for all of the fuse and relay locations so you can check the affected ones related to the circuits that are not working to determine what is missing or blown. Relays are harder to check than fuses. The easiest way to check to see if a relay is bad is to use a known working relay in place of a potential bad...
    view full answer...
  • Availability of Ford Replacement OEM Wiring Harness # 118243 Without Fuses, Relays and 7-Way
    I checked with my buddy at Tow Ready, who tells me that the pigtail included with the # 118243 isn't available minus the fuses, relays and the 7-way. They sell the full kit only. Actually, even though you don't need them at the moment, having the extra 7-way, fuses and relays could come in handy in the future.
    view full answer...
  • Replacement 7-Way Connector Recommendation for a 2003 Ford F-250 Super Duty
    Yes, if you have the square connector at the rear of your 2003 Ford F-250 then you could use the replacement 7-way part # 118243 that uses this style of connector for installation. Check out the installation video I attached for more info as well.
    view full answer...
  • Troubleshooting a 7-Way on a 2008 Ford F-250 that Has No Trailer Light Signals
    First place I would check is all of the trailer wiring fuses and relays in the fuse box of your 2008 Ford F-250 as it sounds like you may have blown some fuses/relays. Beyond that you can check for corrosion on both sides of the 7-way connector and clean as necessary. I attached a help article on troubleshooting trailer connectors for you to check out as well.
    view full answer...
  • Brake Lights on Trailer and 2002 Ford F-350 Stopped Working After Fixing Bad Trailer Ground
    On your 2002 Ford F-350 the fuse panel is in the cab of the truck like you said. If all of the fuses are good then it is likely a bad relay. In the fuse panel location 6 is a the turn/stop relay, location 18 is the turn/brake on/off switch relay, location 34 is the brake on/off switch fuse. Any relay or fuse that says trailer tow or has anything to do with brakes is what you will want to check. Checking fuses is easy but for relays the easiest way is to use a known good relay in place...
    view full answer...
  • How Long is the Harness of the 7-Way Trailer Harness part # 118243
    The length of just the harness of the part # 118243 is 28 inches not including the 7-way.
    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...
  • 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...

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