Arrives before Christmas To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
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Tired of spending hours installing wiring harnesses? The Curt 5th Wheel/Gooseneck Custom Wiring Harness is a game-changer, offering a simple, plug-and-play installation without any need for cutting or splicing wires. Simply plug into your truck's existing factory wiring, and you're good to go. This custom fit makes the set-up time fly by, so you can focus on hitting the road.
Whether you're towing a 5th-wheel or a gooseneck trailer, this harness meets your needs with its 7-way, blade-style connector. It offers easy connections for reverse lights, tail lights, brakes, battery charge, turn signals, and even the all-important ground wire. With this kind of versatility, you can tackle any towing task with ease and confidence.
Trucking with an aluminum bed? No worries—the included stainless steel bolts and rubber well nuts in the installation kit provide crucial isolation to prevent galvanic corrosion, ensuring that your truck bed stays corrosion-free. It's designed for aluminum truck beds, so you can enjoy a reliable connection without the risks associated with dissimilar metal contact.
Worried about the fit? Don’t be. With a generously long 7-foot harness, this wiring solution easily reaches from your truck's rear bumper to the bed. It’s the perfect length to accommodate most modern trucks, including those with extended beds, giving you room to position it exactly where you need for optimal hookups.
If you’re driving a recent model from Ford, including the F-150, F-250, or F-350, this kit is made to match. It integrates flawlessly with the factory tow package, maintaining your original 7-pole connector at the rear of the truck while adding convenience with another plug right in your truck bed. It's modern convenience blended seamlessly with factory style.
The package comes complete with everything you need for a smooth setup—zip-ties, bolts, and well nuts. No extra tools are necessary, making your installation straightforward and faster. It's all you need in one box, putting you on the road more swiftly, hassle-free.
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The installation video from etrailer.com was extremely helpful and provided exactly the information I needed to complete my turnover ball project. The wiring harness appears to be of high quality and has received strong recommendations from everyone I've consulted.
have not had the opportunity to install the replacement part yet but it was so easy to get the new piece and amy was very efficient is connecting me with the right part.
Gwendolyn Y.
10/2/2025
I'll give Amy a high-five and tell her it's from you, John! What kind of trailer are you towing?
The ordering process was very simple. The videos on the how to install very helpful. And the actual installation was very easy.
Well made no more problems with the trailer lights
The Curt 7 pole wiring harness worked great. I had to order this part because the Bargman harness I ordered first did not work on my Ford F250.
Work like a charm, easy to install instructions for great. Would definitely purchase again.
David
5/20/2025
The electrical harness was seamless, totally worth the money, minutes to install. Would purchase again!
It fit as it should with no problem. I actually didn’t end up mounting it into my bed. I had a OEM plastic storage area that I used for mounting the outer inside the bed.
Very easy to install. Completely plug and play. I tried a different brand from my local O'Reilly but it was wired wrong. Returned it and ordered this one. Should have got this one first. No problems with this one and would recommend it to anyone. You will not go wrong.
Part was exactly what I ordered. Installing it was easy
Bob
6/28/2025
Working great, no issues
Great product, easy to install.
Perfect fit, easy installation
PLUG AND PLAY install...only 1 hole needed to be cut for the install...everything else is plug in and go.
Great product. Was exactly what you needed to make a quick connection to the truck for connecting your fifth wheel . Nicely designed.
Installed this in my 2021 F-150 long bed. Was able to cut a hole right by my onboard outlet in the bed of my truck. Simple plug and play install. On occasion the connection isn't the best, but I think it would be better if I used some dielectric grease on the connectors.
Mitch B.
12/14/2023
Over a year with this and everything is working very well
Mike L.
12/14/2023
Works just like it should. Installed in about 15 minutes.
Great product. Plug and play mostly. I would be willing to spend a few more bucks if they sold it with the hole saw bit and the grease as a package deal. The plug is very easy to install. It helps to lowered the spare tire down to make room to make the connection, then all you have to do is cut a hole in the inside of the box, route the cord and mouth the outlet.
Kyle
7/30/2023
Great, no problems. Used quite regularly.
Only feedback I have is that one of the frame brackets where we had to press fit the bolt grommet was oversized and didn't retain the grommet. We worked around it to hold it in place until we could engage the bolt. Other than that we love the fit and finish and are very pleased.
Craig B.
12/21/2023
Wiring harness has worked great no complaints. Easy to install, no issues.
Great product and easy assembly.
First, what I like. This system was easy to install. The cable length was perfect. The connector system to splice into the stock connectors was perfect. The directions accurately detailed the hole-saw size needed to drill in the truck bed. The umbilical from my 5th wheel seats securely. The problem I have is the mounting screws. The screws are steel while the 2020 F250 bed is aluminum, meaning there is the possibility of corrosion with dissimilar metals. The connectors design solution is rubber grommets to isolate the steel from aluminum. With only a few plug/unplug cycles, the grommets failed, the connector came loose. I had to remove the mounting system and replace with steel bolts, using silicone caulk to provide corrosion protection. Bottom line, connector mounting system doesn’t work.
Fit and finish are excellent and work as expected. I would be cautious with measuring for the hole in the bed, depending on what if any bedliner is installed. In my 2018 F150 the factory spray in bedliner was thinner than the measurement in the instructions. This resulted in the hole being off center by 1/8". This is not a deal breaker, just something to be aware of, and is the responsibility of the installer. I Regularly pull a 9800 pound fifth wheel camper and gooseneck dump box with no issues.
Perfect ready to use,easy to install,thanks
This was a C57008 for a '18 F250 6' box. The item was delayed because of the new vehicle. But etrailer kept me well informed of the progress. The plug system was so convenient without having to splice the right wires and the 7' length was just long enough to locate the socket just ahead of the wheel well for my slide in camper. It also included a nifty isolation kit to avoid screwing directly to the aluminum bed.
ANY time I need something related to trailer parts or towing, etrailer is my source and suggestion for others
Lester
6/13/2022
Worked Great, very simple
Excellent! Everything was delivered on time and in good shape.
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Victoria H.
4/3/2025
That's awesome! I'm happy to hear the installation videos came in handy for you Roman! Any upcoming adventures planned?