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Trailer Wiring Harness Installation - 2017 Nissan Pathfinder

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How to Install a Trailer Wiring Harness on a 2017 Nissan Pathfinder

Today on our 2017 Nissan Pathfinder we'll be taking a look at and installing the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, part number 118670. Here's what our wiring looks like installed. As you can see, it's a four-pole flat connector here, which will give us our running lights, our turn signals, tail lights, and our brake lights on our trailer. It's all the lighting functions that are required by law in order for us to safely tow a trailer. Now, our wiring has this nice dust cover that's built into it to help protect it from the elements and any dirt or corrosion that could possibly occur. That way, when you're ready to hook up to your trailer, you'll know your wiring will be ready to use at any given time. What I really like about the Tekonsha wiring harness that we used today is it's really easy to install, plugs right in, and it gives you adequate length wire to run the wire right down next to your hitch.

Now that we've gone over some features, we'll go ahead and show you how to get it installed. Okay, with our rear hatch open, we'll begin our installation by opening up our cargo cover here. Inside, this bottom tray we'll need to remove. We'll find three 10 millimeter screws. We'll remove these. Now we need to remove our trim panel here that covers our threshold.

Pop out the center section here over our hatch latch first. We'll grab our weather stripping, and we'll pull it away from the vehicle. Take a trim panel tool, and we'll pry up underneath. You can also use a flat head screwdriver for this. Set that aside. Now we'll find four clips that hold our storage bin in place.

Pop those up and close our cover now. Now we need to remove the carpet from the lid that goes to our back seat. It's held in place with some fasteners. Just pry up. Should be four on each one.

Now we'll grab our storage bin, pull up on it, lift it on out. Okay, now on our driver side we'll open our tie down covers here and we'll pop open the cover, push it through the latch. We'll find its handle near a bolt underneath. Make sure we do this on both of these. Remove those bolts. Lift out our tie downs. We'll remove this fabric cover here by popping off these clips here. There's two of them. We'll set this aside. All right, now there's this metal bracket right here. It's held in place with four 10 millimeter bolts. There's two that are right here, and there's two more on the back side. To get to those, you'll need an extension with a universal joint or a wobble socket. Now we'll pull this out, set it to the side. Now, off to the left here we'll find two connectors. There's a black one right here, and a white one right here. We'll be plugging our relay harness into those two connectors. We pop those two connectors loose from the back of the vehicle so we can make our connections a little bit easier. Here's our relay harness. This is where it plugs into the vehicle, this black and this white plug, and there's three relays that go here. There are two that are exactly the same. As you can see, they only go in one way, and then there's one that's different. We'll start by plugging in our two that are exactly the same, making sure we plug it in the right way. Once they click in place, you know you're good. Now we'll wrap our relays with the included foam padding. This will keep them from making noise if they we're to rattle around in the back of our vehicle. We'll just place that on there, wrap it around. We'll do the same for all three of the relays. Now we'll take one of our zip ties and we'll just bundle these together. We have our relays all wrapped up. We'll now plug our harness into the connectors on our vehicle. They only go in one way, so it makes it easy. Once they clip in, you know you're good. Okay, now we'll take our bracket, slide it back into position, and secure it with the hardware that we removed. Now we'll reinstall all our panels and compartments in the reverse order of disassembly. We'll place back in our threshold cover here now. Sure it all snaps back in place. Place back on the cover here, and we'll reinstall our weather stripping. All right, now on the passenger side of our vehicle underneath just in the center of our exhaust, we'll find this connector right here with six wires going into it clipped to the body. Pop it off, and we'll pull it on down toward us a little bit. Where that tab is, we'll grab it with a pair of needle nose pliers, push in, pull back, and our connector's now ready for us to connect our wiring harness to. We'll take our wiring harness and we'll plug it in. Now we have this ring terminal right here. It's the ground for our trailer wiring. We need to attach this to the vehicle sheet metal with the provided self-tapping screw. We'll just take the ring terminal, place our self-tapping screw into it, and then attach the sheet metal just like that. Now we'll route our wiring to the center of our vehicle, going behind the fascia attachment tab. This will help secure the wiring and keep it from falling down. Then we'll just drop it down here, where we will attach it to our hitch using a mounting bracket. We'll be using a four-pole flat mounting bracket here. It will conveniently mount right to the included tab on our hitch. This bracket is part number 18144, if you'd like to purchase one. We'll just stick it over our hitch and drop on the included hardware. With our screws in place on the top side, we'll secure it with the little lock nuts on the bottom. Okay, we'll hold the nut in place and use a right angle screwdriver here to tighten the screw. Now we'll take our four-pole flat, stick it through the back side of the bracket, and push until it locks into place. Then we'll take our dust cover here and fold it back closed over it. We've strung together a couple zip ties here to help hold our wire up so we don't see any of it underneath our vehicle and keep away from our spare tire. We ran it over to this wiring harness inside the vehicle here. Like I said, it's just to help hold it up and keep it up out of the way for a more visual pleasing look. Now, inside our engine bay on the driver side of the vehicle we'll have this fuse and relay box right here. In some instances, we may need to add relays in there. We'll grab this tab here and open the cover. Now, in our case, we see that there's two relays in place here already. In some applications, these two relays won't be here, and we'll install the two that come with our kit. Now, these relays are the exact same as the other two relays that we used in the back that we're blue as well. They only install one way, and it doesn't matter which one goes where as long as you put one in each location if your vehicle isn't already equipped. Since ours is, we can replace our fuse box lid right now. Okay, we'll reinstall our cover now. Make sure it's snapped back in place. With that done, we can test our wiring now. We're using a four-pole flat trailer tester. It's part number I26 on our website if you'd like to purchase one. We'll start by turning our headlights on. As you can see, our tail lights and running light circuit on our trailer will be working. We'll do a left turn signal now. That's working. A right turn signal. That's working. Now I'll step on the brakes. As you can see, those are working as well too. That completes our look at and installation of the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, part number 118670, on our 2017 Nissan Pathfinder.

Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Joshua S
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Joshua S
Employee Jacob T
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Jacob T
Employee Chris R
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Chris R
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Zach D
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Robert C
Employee David F
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