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Trailer Wiring Harness Installation - 2015 Ford Edge

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How to Install a Trailer Wiring Harness on a 2015 Ford Edge

Today, on our 2015 Ford Edge, we're going to show you how to install the Tekonsha T-One Vehicle Wiring Harness with the 4-Pole Flat Trailer Connector. Part number is 118677. Here's what our wiring is going to look like when we get out of the box. We've got our yellow and brown wire. This is going to go right in between the factory connection for our driver's side tail light. Of course, our 4-pole flat wire, that's what we're after.

That's going to give us all the signals we need for our trailer light stop. We got our 12-volt black wire that comes off. That's going to be attached to the larger bundle of wire and ran up to the battery. We got our ground wire here. That's just going to go to a ground on the frame and then we've got the red and green wire that's going to go behind our passenger's side tail light. We're going to have a fuse holder, self-tapping screws, some foam tape, everything we need to make our kit happen, maybe with the exception of a few zip ties or a few incidentals, but this is going to be most of what we need to get everything done.

Yeah, the full kit of instructions and then we've got our black module light box here. This is kind of the heart of the system. This is going to protect from any kind of overloading of the vehicle. Since we're getting our power from the vehicle battery, it's going to protect the electrical system on the vehicle. This converts the inputs coming from our passenger's side and our driver's side tail lights into usable information that'll go through our 4-pole wire and eventually run the lights on our trailer for us. To begin our installation, we're going to remove both of our tail light housings, passenger's side and driver's side. Now, we want to gently pull back on those, kind of wiggle them a little bit.

We're going to separate the connector that's right here, so push in on that tab and hold it up. In your application, that should probably be all you have to disconnect. This one has a diode wiring kit. This is a vehicle that gets towed behind an RV, so there's also going to be a couple of connections there that we're going to undo for that, but in typical application, the white and the yellow wire that we have here, you're not going to have to deal with, as we're separating that plug right there. Let's set this some place safe. We'll do the same thing on our passenger's side.

I'm going to take a piece of airline tubing here, but you can use a coat hanger or whatever your preference is, just something kind of stiffer, semi-straight I guess. Then we're going to poke that down towards the bottom of the vehicle, not all the way through. We want to leave some hanging up. What we're going to do is kind of use that to pull our wiring up in the bottom. Let's leave that one hanging there. We'll do the same on our passenger's side. I'm going to tape off my plug here to my pull wire or pull cable, whatever you're using. Sometimes, it gets a little jammed up in there and you got to pull pretty hard. I like to put a lot of tape on this one. All right, now we'll see if we can get it to come up. What we'll do is take the side that matches up with our factory connection there. Push that in so we can hear it click and we can move it around. Then as we we're kind of pulling there, it separated from its little hold over here on the side. Just push it down in there and push it back into its fastener location. Now, we'll slide our connection there in our factory connector. Then we can put our housing back in place. We can see right here in this area, we've got a good spot, double thick steel here, even really triple thick steel. We're going to put our ground right into that. We want to use a 3/32 drill bit and just drill a pilot hole to start. Once we get that drilled out, let's bring our ring terminal up. It's going to be off of our white wire or ground wire, then we'll use the provided self-tapping screw to secure it right in place. Now, we'll strip back the end of our black wire just a little bit. We're going to add on one of the supplied butt connectors and bring in the end of our black coil of wire, that bolt coil of wire we had. We're going to connect it onto the other side. Now, let's tape that up good. Now, I'm going to take a couple of zip ties that are just a little bit longer than the ones that come with our kit and I'm going to connect my module light box right up to the factory wiring that exists there. Now, we'll tape the red and green wire off to another gear 00:05:47 wire or pull cable, whatever you've been using. I'm going to push it over my hitch and through. Basically, you're going to go behind the heat shield along the back side of the bumper here. Once we get it to come out at that point, we're going to pull it back, then we're going to attach our 4-pole wire to it as well. Then we'll use our red and green wire as a pull wire for that. For my 4-pole wire, I want it to come out right here, right in that middle slot. Right there is where I want that. That have whatever wiring there. Now, let's continue running our red and our green across, but before we pull that up to our tail light housing, let's clean up over here on the driver's side. We'll grab our zip ties and just go around any of the loose wires, get everything up and kind of connect them together. We can get our passenger's side taped up here. Then just like we did on the driver's side, we'll attempt to pull it up behind that housing. Now, we'll fit our connectors together on this side. I got a little bit of extra red and green wire here. I want to bundle those up. Make sure to zip tie them off so we don't have to worry about it going back down or falling down underneath the car. Then we get our housing put back in place. Now, these two, you're probably not going to have to deal with. These are additional wiring that we've added on to the vehicle. This one is one that you're going to have. You should hear an audible click and we'll be able to put that right in place. Now, it's time to run our 12-volt power wire up to our power source. We're going to be using the battery, so we'll make sure we get a good connection on it here, so we can pull it up through and it won't separate. As we move forward, we're going to avoid sources of heat, any pinch points, any sharp objects and any moving objects. Anything that could do damage to our wire, we want to avoid that. Now that we're over here, we can kind of go over the top of the gas tank filler there. There's a brake line that comes in right there. If we kind of run it up around the top edge, see here we've to our brake lines again and we're hoping those are in a safe area, right Just tag along with those and it shouldn't have any issues with our wire. Just run it up along our cover here on the bottom. These little clips that are on there to hold those line place will do a good job of allowing us to get some zip ties around them, make a good anchor point for us. Now, if we continue to follow these black lines that run, those are going to go right up by our . The two larger ones that we we're going to go right up by our battery into our master cylinder kind of location. We're going to track right up that way, kind of follow along with them. We'll just try to poke as much of a line up there as we can or our wire up there as we can. That way, when get up top, we'll have a good chance to seeing it. I'm going to pull all my wire up from the bottom just like that and I'm going to anchor it off again right up here. I don't want any of my wire to come down from the front. Let's head up top and see if we can find our pull wire. We'll just pull it on up here where need it to work with it. I'm going to trim off just a little bit of extra here. I'll go ahead and get our fuse holder set up. What we want to do is cut that at about the 4:00 position there, strip both sides of that off. Let's also strip our black wire back while we got our tool out. Let's twist our ends up. At the short side of our fuse holder, we're going to add a ring terminal. The other side is going to get a butt connector. Then that's going to go to our black wire. Not a bad idea to put a little bit of tape on this connector here. It's going to give you kind of like a moisture barrier. We'll pull back that positive cover we can see there. It'll go right to that stud with that ring terminal. That one does not want to come all the way off so what we're going to do is just to notch out of our ring terminal there. That one will then slide around like you see there. Then we'll tighten that back down. Now, let's tuck our wire just kind of under that cover to keep a clean look. We've got our little bit of excess here in case we ever need to make any changes, loop that up. Just use a couple of our zip ties to tidy that up. Now, we can just bring that down and we'll secure it off. Insert the negative battery cable there. We have extra if we need it, but it's up out of the way and we won't have to worry about it interfering with anything. Trim off that little bit of extra. Take out our 15-amp fuse which is going to come with the kit. Place that right into our fuse holder and then put our cover on. Then tuck that down. Now, if we ever need to get to it, it'll be right there, but it's not in the way if we don't. To test out our wiring, we want to use our ground clamp from our test light on the ground side and then we'll have our running lights turned on. What we're looking for is going to be a constant signal from that brown wire. All right, so far, so good. Now, we we happen to turn on the left side blinker. That's going to be our driver side. That should give us a flashing signal from the yellow wire. All right, now same thing, we should get off the green wire when the passenger's side blinker is on. All right, and finally our brakes. When the brakes are applied, we want to see a constant signal from the yellow and the green. All right, everything is working as it should. We can just get our wire tucked away here and it'll be ready for use when we need it. With everything working as it should, that's going to complete today's installation of the Tekonsha T-One Vehicle Wiring Harness, part number 118677 on our 2015 Ford Edge.

Info for this part was:

Employee Joshua S
Video Edited:
Joshua S
Employee Zach D
Video Edited:
Zach D
Employee Cole B
Installed by:
Cole B
Employee Randy B
Test Fit:
Randy B
Employee Robert C
Test Fit:
Robert C
Employee Chris R
Video by:
Chris R

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