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T-One Vehicle Wiring Harness Installation - 2016 Volvo XC90

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How to Install the T-One Vehicle Wiring Harness on a 2016 Volvo XC90


Speaker 1: Today on our 2016 Volvo XC90 we're going to be taking a look at and showing you how to install the Tekonsha T1 Vehicle Wiring Harness with Four Pole Flat Trailer connector, part number 118683. Here's what our four pole wiring looks like once it's fully installed. It is going to stay on the inside of the vehicle until we're ready to use it, and then we can drop it down and we'll be ready to hook up.Now, it is going to give us a four pole flat trailer connector, which is going to give us all the required lights to get down the road safely, such as our brake lights, turn signals, and taillights. When we're not using it we can store it where our spare tire is, and it'll be out of the way and ready for us whenever we're ready to tow. Now that we've seen what it looks like once it's installed, let's show you how we got it installed.To begin our installation we're going to need to open up our rear hatch, and we're going to need to remove the floor covering. Now, we can just lay it out of the way back here, and we're also going to need to pull up the spare tire cover as well.

This, too, we can just set up front out of the way. Now if we bring our attention over to the driver side, we're going to need to gain access behind this panel. Now, if we look up there's going to be a small knob. If we turn it, it'll allow us to unlock that panel and pull it out. We'll go ahead and set that aside for now, and we can go ahead and move over to the passenger side.Starting with this plastic tray on the bottom, we're going to have two tabs.

If we push in on those tabs, we'll unlock it, and we can pull the tray out. Next, we're going to have to look for our cargo hold down, which is going to be on the very back of our vehicle in the hatch area. If we flip down the hook, we're going to see that there's a fastener holding it in place. I'm going to be using an 8 millimeter socket to remove that. You can go ahead and pull the tie down hook out, and we're going to set this aside for now.Now, our threshold here is also going to have to come out.

We're going to have two bolts, one on either side of our latch system, and we'll be using an 8 millimeter socket again to take those out. The bolts removed, we start on one end of our threshold and we lift up. It'll release the clips, and we're just going to work our way down until we can set it aside. Here on the passenger side we're going to grab our panel kind of low, and you want to get a firm grip on it, and we're going to pull away. Once we can get enough to grab the edge, I'm going to stick my hand behind, and you hear that pop, that's the clips releasing.

We just want to pull it away just enough so we can gain access to our taillights.We can go ahead and grab our harness. Before we start connecting anything, we're going to need to reach inside this compartment here, and we're going to need to unconnect our taillights from the wiring. Our connectors are going to be right here going towards the back of our vehicle. There's going to be a small tab or button that we're going to push on, and that will release the plug and then we can disconnect. Now, on the end of our wiring harness we should have a connector that looks just like this, as well as the opposite. Now, the end that has the yellow and brown wire, that's the one that we're going to be working with over here on the driver side. I'm going to take the male end of my harness and plug it into the female of my vehicle. Then I go ahead and take the female end and plug it into my taillight.Now we can bring our attention to our green and red wire. Now, I'm actually going to take my wire and the connectors, and I'm going to go under this panel right here. That way it won't be out of the way whenever I go to put my panels back in place. Once I get this all the way through, we're going to be routing this over to the passenger side, and this is going to be connecting to the passenger side taillight. We're just going to run it along the threshold. Then I'm going to pull my panel back and I'm going to disconnect my taillight, just like we did on the driver side. Again, we'll plug the female from the car to the male on our harness, and then take our harness and plug it into our taillight. Make sure all my connections are locked into place. Then I can take my excess wire and start tucking it under the panel to make sure it won't interfere with anything.Now, we should have a white wire with a ring terminal left on our harness, as well as an orange wire with a ring terminal. We're going to start out with the white wire with the ring terminal, and that's going to be our ground. I'm going to ground it right here at our battery, since it is right here. We're using a 10 millimeter socket to loosen up the nut so I can gain access to the post. We should have an orange wire with a fuse holder and a ring terminal attached, along with a white wire with a ring terminal. We're going to start with our white wire. That's going to be for our ground. Now, we have a factory ground right here just towards the inside of our trunk. We'll go ahead and remove that nut so I can slide my ring terminal in place. We'll be using a 12 millimeter ratcheting wrench. I'll pull my bolt up, slide my ring terminal over my bolt, and then rethread the bolt in place.Now, a trick is, since this won't slide over the bolt, it is just slightly too big, I'm going to take a pair of cutters and I'm actually going to cut this, cut a notch out. That way I can put my bolt back in and just slide it around the bolt, and then we can tighten it back down. Now for our orange wire with the ring terminal and the fuse holder, I'm going to go ahead and pull the fuse out before I go and make any of my connections. I'm going to set it aside for now. This end we're going to have to go to the positive post of our battery. Which, fortunately, our battery is right here. If we come towards the front and lift up this small cover on the corner, we'll have the positive post right here. I'm going to remove that nut and then slide the ring terminal over, and I'm going to be using a 10 millimeter socket to remove that nut. Slide my ring terminal over and then reinstall the nut on top, tighten it down.Now we're going to need to find a spot to mount our converter box here, and they do provide us with some double sided foam tape. I'm actually going to take the back off of one side, and I'm going to stick it to the back of my converter box here. Want to make sure to push firmly so the glue sticks nice and good. If we come right below our threshold here and right behind our battery, there's a nice flat spot down here that we can mount it to. I'm going to go ahead and take the backing off, move everything out of the way, and then push firmly against the back of the car so the glue will stick, and our four pole wire, can actually just leave it right here, because it is going to stay on the inside of the car until we're ready to tow.We can go ahead and put our 15 amp fuse back in place and start tidying up all our wires. I went ahead and zip tied my green wire that was going across my threshold to some existing wiring. That way it's out of the way and I won't have to worry about it getting damaged. Now we can start putting all of our panels back in place. Now all we have left to do is to test our wiring. Now, I got a four pole tester here. I'm going to have somebody else run my lights so I can verify that they're working properly. Can I have the headlights please Good. Left turn signal. Right turn signal, and the brakes, and the brakes and both turn signals please. Looks like everything's working properly and we're ready to hit the road. That'll finish up our look at the Tekonsha T1 Vehicle Wiring Harness with Four Pole Flat Trailer Connector, part number 118683 on our 2016 Volvo XC90.


Info for this part was:

Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Kathleen M
Video by:
Kathleen M
Employee Dustin K
Video by:
Dustin K
Employee Chris R
Video by:
Chris R
Employee Cole B
Installed by:
Cole B
Employee Robert C
Test Fit:
Robert C
Employee David F
Test Fit:
David F
Employee Ryan G
Test Fit:
Ryan G

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