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Curt T-Connector Vehicle Wiring Harness Installation - 2018 Ford F-150

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How to Install the Curt T-Connector Vehicle Wiring Harness on a 2018 Ford F-150


Hey everybody, Ryan here at e-trailer. Today on our 2018 Ford F-150, we're going to be taking a look at and showing you how to install the CURT T-connector Vehicle Wiring Harness, with the seven-way connector. So you'd want to use the seven-way for a couple of different reasons. One your trailer that you plan on towing this style of connector, or you plan on towing a trailer that has a brake controller. So this is going to give you the capability to do both since it just taps into our factory wiring, more or less just plugs right in that factory wiring is already going to be pre ran and allow this to put out that electric brake signal, as well as that auxiliary power signal. That way you're able to charge up any batteries that you might have on your trailer, while you're towing it down the road, such as a small pop-up camper or maybe a utility trailer that has a dump bed.So this harness is going to eliminate the need to piece together a whole entire kit and run a bunch of wiring like you normally would have to do.

So with this, it's just going to utilize that factory wiring in your truck and make life a lot more simple. Now, something I do want to mention is that the kit does not come included with the bracket and we have many different types available here at etrailer. However, I really liked this one because not only we can mount up our seven-way, but we're actually able to also mount of our factory 4-Pole that way they're next to each other, and really easy to get to. Now the connector here itself is going to be nice and heavy duty. Whenever we open it up on the under side, there's going to be a rubber seal and that's going to help keep out moisture and dirt and debris whenever we're not using it.Now, with that being said, I'd like to go step further and every now and again, cover the terminals with some dielectric grease.

And also on the bottom of the cap, there's going to be a clip here that way, whenever you plug your trailer connector in, this clip is going to kind of ride down on it and prevent your harness from accidentally getting pulled out. So if you're just needing to pull a trailer that has a seven-way plug, this is all you're going to need, but if you're pulling one that has brakes and you're going to want them to work, you are going to need to pick up a couple more things to complete the package. You're not only going to need this, but you're also going to need an adaptor plug for a brake controller that simply plugs into a factory connector under the dash, and you're going to need the brake controller itself.But other than that, it's going to give you the capability to hook up to trailers that have a seven-way connector. And in my opinion, it's definitely the way to go since it just utilizes that factory wiring that's already ran back here because it utilizes that to get this installed, it's going to be really straightforward. Speaking of which let's go ahead and hook it up together now.

To begin our install, we're going to be working underneath the back of her. We're going to need to locate the factory harness that should be here on the driver's side. So that would be connector that we're looking for is right here. It's just sitting on top of this support beam. We're going to disconnect it the way to do that.

It's a little tricky to see. So you'll have to kind of go off feel, but on this side, there's a tab in the center and if you push down on it, pull the two connectors apart.So that's that little tab I was talking about. Let me push down on it. That's going to allow you to pull them apart from each other. Now we can grab our new T-connector wiring and get it plugged in. What I like to do is use some dielectric grease in here just to help prevent any potential corrosion. If you need some of this dielectric grease, you can find it here at etrailer. I'll coat both sides from there it's really straight forward, one plug is going to get connected one side of the factory wiring, then the other side it's flooding to the other end.Now we can take our white wire with the pre-attached ring terminal and ground that to the body of our vehicle is a pretty solid piece of metal right here, easy to get to. So I'm just going to use that and I'm going to secure it using the included self-tapping screw. Now we can take the other end of our wiring and run it to where we're going to mount it. The kit doesn't come included with the bracket. So if you want to do it like this, you're going to have to pick it up. And I just slightly modified it where our factory 4-Pole wiring was right up in here in this area, I just attach a bracket to it. I had to kind of file this opening on a little bit larger or factory 4-way will slip right in it. We can take our new wiring end, slide that through. Again we'll use some dielectric grease the terminals.We can take our seven-way plug and connect. From there we're able to put that into our bracket and get it secured. So I went ahead and secured up our wiring to help clean up our install look just using a handful of zip ties that come included with the kit. Now that we have everything hooked up, it's a good idea to test of the functions, to make sure it's working properly. Try the left turn, a right turn, our tail lights, our brake lights, our reverse lights and our 12 volt power output. Now with these trucks, the 12 volt power output the brakes have to be applied and you have to be hooked into either a tester box like this or one of your trailers. We'll get our 12 volts. And if you we're to install a brake controller, you would test the brake output signal as well.Just something I'd like to point out if you're having any issues or not getting any of your signals at the back of your seven-way. What I have encountered in the past is that sometimes depending on what truck you have, the trailer wiring fuses here underneath the hood and the piece box could actually be missing. So it's definitely something to check if you're having any issues, just get in your owner's manual and read through it and make sure that all the fuses are not only good, but actually in the fuse block itself. And that'll finish up our look at and our installation of the CURT T-connector vehicle wiring harness on our 2018 Ford F150.


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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Ryan G
Test Fit:
Ryan G
Employee Bradley B
Test Fit:
Bradley B

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