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  1. Custom Fit Vehicle Wiring
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  5. 7 Round - Blade
  6. No Converter
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   (365 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.


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

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.

2001 Ford F-250 Super Duty

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


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

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

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!


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

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


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

  • Where Do I Put the Relays Provided with 118243 In My 2000 Ford F-250 Super Duty Fuse Box
    The trailer tow backup lamp relay and trailer tow battery charge relay that is provided with the Tow Ready 7-way wiring harness part # 118243 for the 2000 Ford F-250 install in the trailer tow relay block. The relay block is located in the engine compartment near the brake master cylinder according to the owner's manual. The trailer tow backup lamp relay is position 38 and the charge relay is position 39. The Relay block is near the power distribution box in the engine compartment.
    view full answer...
  • Wiring Diagram that the Ford Replacement OEM Tow Package Wiring Harness # 118243 Uses
    If you check out the picture I attached the middle set of 7-ways is the wiring diagram/colors you'll need to use for the Ford Replacement OEM Tow Package Wiring Harness # 118243 that you referenced. The harness is already wired up correctly though so there wouldn't need to be any additional wiring.
    view full answer...
    Image 1 for
  • Trailer Lights Not Working on 1999 Ford F-250 After 7-Way Install
    If you are testing the pins inside of the Ford Replacement OEM Tow Package Wiring Harness part # 118243 and none of the circuits are active then you most likely have a few blown or missing fuses. However, there could also be an issue with the connectors so make sure to test the wires leading up into them and after to make sure power is not stopping at one connector. I have attached for you the fuse locations you will need to check below that relate to the trailer towing circuits on your...
    view full answer...
  • What Does the Tekonsha 118243 Fit?
    The plug on the end of the Tekonsha # 118243 that connects to the vehicle does indeed have 4 larger pins and 4 smaller pins. I included a picture of the plug end of the harness, but it isn't super easy to see the pins. It should be noted that this will fit a 1999 to 2001 Ford F-250 and F-350, F-350, F-450, and F-550 Cab and Chassis, and the F-53 with the factory tow package.
    view full answer...
    Image 1 for
  • Trailer Wiring Harness for a 2002 Ford F-250 That Connects To Square Plug Under Vehicle
    In order to obtain the trailer wiring harness that connects the square plug under the vehicle to the back of the 7-way trailer trailer connector you can use the Ford Replacement OEM Tow Package Wiring Harness part # 118243. I understand that you are just looking for the wiring harness portion but we do not offer this separately as this is more or less a part of the factory wiring which we don't really carry therefore this is your best option unless you want to go to the dealer. The harness...
    view full answer...
    Image 1 for
  • Troubleshooting 7 Way Trailer Plug on 2020 Ford F350 Super Duty With No Power on Plug
    In the top left corner of the engine compartment fuse box, you're looking for #7, which is a 30a fuse and corresponds to the "Trailer Tow Battery Charge"; there should be a fuse box diagram either in the owner's manual or on the cover of the fuse box that you can use to confirm this. You'll want to check to make sure there is a fuse in that spot and that it's in good working order. I would start by checking there; if you're still having issues after checking the fuses let me know and...
    view full answer...
  • Troubleshooting Not Being Able to Find Fuse Slot Listed in Owner's Manual of Vehicle
    I am not totally sure what your vehicle is, but sometimes there can be more than one fuse box on a vehicle and you may be looking at the wrong diagram or box. Check to see if there is a fuse box on the interior of your vehicle as well as one under your hood.
    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...
  • 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...
  • 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...
  • Troubleshooting 1995 Ford F-350 that Lost Taillight Circuit After Trailer Wiring Short
    One of two things happened. Either you shorted out the truck's wiring before a fuse was able to blow or there is another fuse on that circuit that could have blown. Fusible links are often found on older vehicles. These can be hard to find but they are on the circuit to act as another fail safe in the event of a short. The best place would be to start where the trailer wiring harness splices into your vehicle's wiring and then work your way back up the circuit looking for fusible links,...
    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...
  • 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...

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