Tekonsha T-One Vehicle Wiring Harness Installation - 2018 Chrysler Pacifica

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How to Install the Tekonsha T-One Vehicle Wiring Harness on a 2018 Chrysler Pacifica


Speaker 1: Today on our 2018 Chrysler Pacifica, we're gonna be installing Tekonsha's T-One four-pole flat trailer connector vehicle wiring harness, part number 118712.This four-pole vehicle wiring harness is gonna provide you with all the necessary connections you'll need at your trailer. This is gonna give you your left turn signal, right turn signal, tail lamps, and brake lamps. So you'll be DOT-compliant in all states.At the back of our four-pole connector, you're gonna have a dust cap that'll keep out any dirt, debris, and moisture, and this'll ensure you have a long-lasting connection that'll be corrosion-free.In addition, you can use it to secure it to your safety chain loop and that'll hold it up out of the way when you're not using it.This wiring harness is custom-fit for your Pacifica. It's gonna plug directly inline with your driver and passenger side tail lamp assemblies. And it has its own module that's going to detect those signals and return them, here, to our four-pole connector, going back to your trailer.What's nice about this separate fuse-protecting circuit that our module has is that if there's any faults on our trailer, it won't cause any damage to the wiring on our vehicle. It'll just open the fuse to our module.

So you can fix your trailer, replace the fuse, and you're ready to get back on the road.We'll begin our installation here at the back of the vehicle. You need to open up your tailgate to expose the screws we're gonna need to remove on our tail light assembly. You're gonna use a T-25 torque socket. We're gonna remove both these screws.And now we can remove our tail light assembly. To make it easier to get the assembly out, I do recommend using a trim panel tool such as this plastic one here to help pry it rearward.

And then we can disconnect our electrical connector here. There's a blocking tab. You'll need to press rearward. And then you can press in on the release and we can now set our assembly aside.We're gonna repeat this on the other side.We'll now take a piece of airline tubing. We're gonna shove it down in the opening hole here and then you can reach down below to grab the other side, and we're gonna use that to pull our wiring up.We'll now take our yellow and brown wire connector end.

We're gonna tape it to that airline tube we ran down so we can pull it back up to our tail light assembly area. So we're just gonna run it around there. I do advise you tape all the way around, up to the top, to prevent it from sticking to the side and getting caught on anything.And then we'll pull our wiring all the way up. Just need enough to get both connectors all the way up. And we can now disconnect it from our pull wire and plug it into our factory wiring.

So we'll take these two ends here, plug our factory wiring into our new harness, lock it down, and then just tuck these out of the way.We'll take our tail light assembly. We're gonna plug it back in. And we can now reinstall our driver's side tail lamp assembly.That'll just push back into place. And we'll reinstall both of our screws.Were now underneath the vehicle on our driver's side. We're gonna need to route some of our wiring across. Before we do that, we're gonna mount our module. So I've got some alcohol on a rag. We're gonna clean off this area right up in here. This'll just insure that the adhesive double-sided tape that comes with it will stick and adhere properly.We'll then take our double-sided tape and peel off one side. We're gonna stick this to the back of our module.Now we'll peel off the tape on the other side and we're gonna stick that module on the area that we just cleaned off. This is gonna be on the backside of the bumper beam.You wanna make sure that the wires sticking out the bottom of the module are facing down so that no moisture collects on them. And we'll just hold it tight. You wanna hold it there for about 20 seconds to make sure that it's got a good adhesion.Next, we'll connect our ground wire, that's the white wire with the ring terminal. We're gonna slide the small, self-tapping screw that comes in the kit through it. We're gonna attach it with a quarter-inch socket.So we're gonna pull back this panel just a little bit here so we can get our tools in there. And we're just gonna thread it right into the bottom of our bumper beam here.Next, we're gonna route our green wire across to our passenger side. This assembly's gonna pull up and plug into the passenger's side tail light, just like we did on our driver's side.So, you wanna try and make sure that you've routed it in a way that it won't catch on anything. So we're gonna route it behind the little bracket that sits here so that way the wire can't fall down.And once we've got it over here, we're gonna use our fish wire trick, just like we did before, to pull that wire up.And then we'll finish pulling it all the way up. We'll now make our connection to our factory wiring and the other end's gonna plug into our tail light assembly. And just like our driver's side, we'll plug it in and reinstall it.Now that we've made all of our connections at the back of the vehicle, we're gonna have to run a power wire from there up to the front. Before we do that, I always like to verify which side my battery's on. Ours is on our driver's side on our Pacifica here. And run down a fish wire, 'cause we're gonna have to pull that wire up into our engine compartment from down below.So we're gonna run it down by our brake booster here. Just try to avoid any moving objects. Stay as close to the fire wall as you can while running it. And this way it'll be ready for us when we get down below.And you always wanna clean up your wiring, so we're just gonna wrap up that excess green wire we've got here and we're gonna zip tie it to the factory wiring that runs across. That way we don't have to worry about it falling down, ever getting caught on anything.We cleaned up our four-pole connector wiring as well, zip tying it just in the same way we did our green wire. And you can connect it to your safety chain loop with the dust cap and that'll hold it up out of the way.And now we'll take the black wire that comes in the kit. You're gonna have a bunch of black wire. We're gonna strip back one end and that's gonna connect it to the black wire coming off of our module. We're gonna use the yellow heat shrink butt connectors that come in our kit and crimp those on to each side.We can then take the heat gun and shrink down our butt connectors.Now we're gonna route our wire to the front of the vehicle. When routing it, you wanna make sure you avoid any moving objects such as your steering and suspension, or any excessively hot items, such as your exhaust.I'm gonna route this wire now, and then I'll show you the path I took to get it there.We then routed our black wire up underneath all of our paneling here. Starting at the back, you can just put your hand in there and start shoving that wire forward. Once you get towards the front here, though, I do recommend using a ten-millimeter socket. Take out these two bolts here and these two plastic nuts so you can pull it down to get that wire pulled all the way through.Once you've got that through, we're gonna go up over our suspension, so it's gonna tuck up over all this. Kinda see it through here. And we're just gonna follow that all the way over the suspension til we come out here, next to our fuel tank. We're gonna go up above our fuel tank inlet hose here. We're gonna come around the side of our fuel tank and we're gonna go back underneath these panels. I took it over across here. I do recommend taking these two screws out. These are also 10-millimeter. And then we ran it along the inside of this black panel here.You'll have to take the nut off along the way in order to get those in there. And then our wire just comes out right here. That way it's completely protected underneath all the paneling going up. And just like before, we're gonna use electrical tape to connect it. And now we'll go back up top and finish pulling it through.And after it pulls taut, it's a good idea to hop back down below just to make sure that the wire didn't get caught on anything and you do actually have it all the way pulled up.Once you've verified it, you can disconnect the wire from your pull wire and we're gonna start routing it over towards our battery.Now we'll prepare our fuse harness. This is the yellow harness with the loop on it. You're gonna wanna cut this loop in half and strip back each end where you just cut it.We'll now connect a ring terminal to one side and a heat shrink butt connector to the other side.We're gonna connect this end of our ring terminal to the bolt located just here underneath our fuse box cover. Fuse box cover comes off really easily. That just snaps into place there. You just squeeze these two and pull it off. And you'll find our wire right there.We'll remove the nut with a 10-millimeter socket. We'll set our ring terminal from our harness on top of it and then reinstall the nut.We're going to the fuse box connector here since this is a direct connection down this wire to our battery positive terminal. It's much easier to get to and it's gonna make a cleaner connection.We'll now take our black wire. We're gonna trim off the excess. I do always like to leave a little bit of excess, just so we've got something for the future. So I'm gonna trim it about here. We'll strip back that black wire and that is gonna connect to the other end of our heat shrink butt connector here.We'll now use our heat gun to shrink down our butt connector. And now all that's left is to insert your fuse and test the system out. You can test it out by plugging in your trailer or by plugging in a four-pole tester. You can pick up four-pole testers here at etrailer.com.I wanna make sure that we have our left turn signal, right turn signal, tail lamps, and brake lamps. And with everything working properly, we're ready to hit the road.And that completes our installation of Tekonsha's T-One four-pole flat trailer connector vehicle wiring harness on our 2018 Chrysler Pacifica.


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