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Tekonsha T-One Vehicle Wiring Harness Installation - 2020 Nissan Pathfinder

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How to Install the Tekonsha T-One Vehicle Wiring Harness on a 2020 Nissan Pathfinder

Today in your 2020 Nissan Pathfinder, we're going to be taking a look at and showing you how to install Tekonsha's seven pole vehicle wiring harness.We have assembly connector located here at the back of the vehicle. That's going to provide our trailer with all the necessary lighting functions, as well as functionality to charge our battery and for the braking system that's installed on the trailer. So inside we have seven circuits. That's going to include your left turn signal, right turn signal, tail lamps and brake lamps, keeping you DOT compliant in all States with the proper lighting, as well as a brake signal circuit, which is the output from your brake controller and auxiliary charged circuit, which is for the battery on your trailer to keep them topped up, as well as a ground circuit, which is required for your trailer, to be able to be connected to the battery in your vehicle, for that charge circuit and the brake controller.And lastly, we have a reverse light circuit in there, which many of your trailers out there don't have reverse lights, but it's always nice to have that option, in the event that you have a trailer that does have reverse lights. So in your Pathfinder, this is going to be great if you're planning on using it to pull something, let's say like a popup camper, or even a small camper. With our seven way here, it's going to have the functionality we'll need for a brake controller because many campers do have brakes on them.

And in order for our Nissan Pathfinder to tow it safely, in many cases, you're going to need brakes on that trailer because depending on how heavy it is, if it's more than the weight of our vehicle, or even coming close to it, we're going to definitely want those brakes to help us with stopping.It's also got that charge line circuit in there, which is great for your campers again, so we can keep those motor home batteries all charged up. That way, wherever we get to our campsite, we've got freshly charged batteries to power any of our accessories and have a good time. And if you have a trailer that doesn't have any batteries on it, the auxiliary charge circuit can operate your tongue jack.Now we've gone over some of the features, let's go over the installation together, so you can have the confidence to do it at home. Everything that we need comes included with our kit, with the exception of a bracket for mounting of our seven way. And this doesn't come included because the location you're going to put the seven ways is going to vary, depending on the hitch that you've purchased.

We've got a Draw-Tite hitch here, so this bracket works out great with it.We'll begin our installation at the back of the vehicle. You will want to lay your third row seats down, if you don't already have them down, and then we can lift up on our cover here. And there are three bolts inside that we're going to need to take out, to move our cover out of the way. We're going to use a 10 millimeter socket to remove the three, there's one in each corner towards the front and one in the middle towards the back. We don't need to take the threshold off so we can get it up.

This just simply pulls up. We just grab it and just give it a little tug. We'll just sit that aside. And down below here, we're going to have four clips and those will just pop up. You can either use a flat bladed screwdriver or a trim panel, remover tool.

Just slide it underneath and then just pop the clip up. Just work your way down until all four of them have been released.With all of them released, we can lift up on our center compartment here. Once we've got it pulled up, we can just roll it forward and it will just sit out of our way.The panel on our driver's side here now needs to come up and get out of our way. So we're going to first pop up the small covers here that reveal our bolts underneath. And I do the same thing with the other cover over here. Sometimes if you can't get it, you can lift up on that and then you can get the cover to pop up. Then you have to kind of set it back down for it to clear, to get it to come up the rest of the way. We'll just take these out with our 10 millimeter and you'll see that there are two more clips here, that's holding this whole panel in. We'll use our trim panel or screwdriver again to pop those up and we can just set this panel aside.So here we have our new harness that we're going to be plugging into that connector. This is the white connector. The one that you could see in the last shot. Right next to it, there is a black connector that's real small that this one will plug into. That one's very difficult to see in this light. You couldn't see it in that last shot, but it's right there. So once you plug this one in, just feel over towards the center of the vehicle a little bit, and you'll find this one's slightly up a little bit higher. We're going to go into the large opening here and reach back to our connectors. Sometimes it's a little easier if you just keep the whole harness tucked in there, so it's not getting caught on anything.Now with both ends of our harness plugged into the vehicle, we can plug our relays in the other end. You're going to have two blue ones and one brown one. Match the brown up with the color that it goes to. It's also the only shape that it will fit into. So you really can't get these wrong. I just want to look at the bottom just to line up the prongs with the connector and plug them in.Also included with your kit. You're going to receive some small foam pads. For demonstration purposes, we're not going to be putting them on, but all you would do is peel off the adhesive backing here and just wrap it around your relays like this. This will help ensure that they're not rattling around and making a bunch of noise. And it does also adhere the relay to the connector to help ensure that it stays secure.We're now underneath the hood on the driver's side. We're just behind the headlight assembly. Our battery's right here and then just to the outside of our battery, we have our little relay boxes here. This small rectangular one here is the one we're looking for. There's a release tab down here at the bottom, just pull outward and you can pop it up and we can slide this off. Now, our relays we're already pre-installed from the factory. If you don't have relays here, you'll want to make sure that you install the relays that come included with your kit. If you've already got relays there, then you're all good to go and we can just clip our cover back on. We're now underneath the vehicle on the passenger side. Just above our hitch here, you'll find your electrical connector for your harness down below. Easiest thing to do with this is to use a pair of needle nose pliers and pinch the end back here and this will allow us to pop the connector out of its little holding spot there. So we're just going to pinch that, then we can just push it on out.Now that we've got it released, we can just bring it down further, where we can easily access it. We're going to remove the dummy plug that's located in it. So there is a release tab right here. We're going to press in on it. It's pretty small, so you may need a screwdriver or something to press in on that release tab. Then you can just slide that dummy plug right out of it. Now that we've got this dummy plug removed, we also need to remove the one from the other connector located right there and just like we did on the other one, we can pinch the little piece on the back and then you can just push that out. That way it'll drop down to make it easier to work with. This one also has a larger release pin, which is that big flat spot there. You just squeeze that and you can pull this right out.We can now take our new harness and we're just going to plug it to those two connectors. Gray is going to go to gray. Black's going to go to black. You can also see the number of pins in there and match those up. So we're just simply going to plug it in. And we'll plug this one in and then we can just route the wiring down our hitch, over to where our assemble connector's going to be. Now on ours, we had a Draw-Tite hitch, which already provides you with the place for a bracket. So we've got a place here on this hitch, but if you have a different hitch that doesn't have a place for a mounting bracket, we've got mounting brackets and no drill brackets available here at that clamp around your hitch and provide a bracket on it, without having to drill into the fascia or anything. In either case you'll want to make sure you pick up a seven pole mounting bracket while you're here, because one does not come included with your kit.We can now take our seven pole connector. We're going to slide it in our bracket and then we're going to attach it to the bracket, using the hardware that came included with the bracket. We're just going to slide our screw through and then secure it with the nut on the other side. Now we'll repeat that for the three remaining holes. Now that we've got our seven pole securely mounted, we can plug our connector into the back of it. I do recommend that you put some dielectric grease on this connector to keep out any dirt and moisture to ensure a long lasting connection. We're not going to be doing this today because this is just demonstration purposes here. We're just going to plug it in. And then the wiring that we have hanging down here, we can just zip tie to our hitch. You may have to hook a couple of zip ties together in order for them to wrap around your hitch.We can now plug in our tester and verify that everything's working properly. If you need a tester like this, we've got some available here at You'll want to make sure that all of your functions are working properly and you can see we've got six lights on our tester because there's six different functions. It's called the seven pole, but one of those is ground and none of our lights will work if the ground's not working properly. The first one that you'll see lit up is our 12 volts and it's going to be lit up the whole time. That's our charge line, to charge the batteries on our trailer. But you also want to make sure that you have your tail lights, your left turn signal, right turn signal, brake lights and the last two features is going to be your reverse lights and your brake controller. Now we don't have a brake controller installed on this vehicle, so we won't be able to see that one working. But if I put it into reverse, you'll see that the reverse light comes on.With everything working properly, we're ready to put the panels back in the rear of our vehicle, back together in reverse order of how we removed them and zip tie up any loose wiring that we have. And that completes our installation of Tekonsha's seven pole vehicle wiring harness on our 2020 Nissan Pathfinder.

Info for this part was:

Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Dustin K
Video by:
Dustin K
Employee Jonathan Y
Video by:
Jonathan Y
Employee Cole B
Installed by:
Cole B
Employee Brent H
Test Fit:
Brent H
Employee Conner L
Test Fit:
Conner L
Employee David F
Test Fit:
David F
Employee Ryan G
Test Fit:
Ryan G
Employee Bradley B
Test Fit:
Bradley B

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