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Trailer Wiring Harness Installation - 2015 Hyundai Tucson

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How to Install a Trailer Wiring Harness on a 2015 Hyundai Tucson


Today on our 2015 Hyundai Tucson, we're going to be taking a look at and installing the T1 Vehicle Wiring Harness with four pole flat trailer connector. Part number 118501. Here's what it looks like. The reason you'd want one of these, because with this system, with the module, it's going to isolate your vehicle lights from your trailer lights, and it's going to isolate any backfeeding 00:00:25 from your trailer into your vehicle. This system is designed to be stored away inside your hatch when not in use, with this little dust cover that's going to cover up the wiring. We would just close it up, it's out of sight. When you're ready to use it, you just take it out, set out the amount you're going to need, close your door back up.

Now it's going to be 00:00:55 all right, you can set it on top of the weather stripping, then when your door closes, it's going to hold it in place. You just want to make sure you keep it away from the center, where the latch is at. You can close your hatch over it, hook it up to your trailer, and you're ready to tow. When you're ready to put it away, put your cover back on, open up your hatch, you can just coil it back up and just tuck it away inside the spare tire carrier. This is what your kit's going to consist of when you open up the package. Here you have your converter box, your four flat trailer wiring, with its protective cover.

Then we'll have the wires to the left and right tail lights, and our hardware package. This roll of black wire is what's going to run your power from the batter to the back of your car, to operate your control box. Now, let's go ahead and show you how to install it. To begin our install, we've flipped open our cargo hatch on the bottom. We're going to take out our taillights with a Phillips screwdriver. Then we take our plastic panel tool.

You can take your palm and just kind of tap back at it. It should release. Sometimes it takes a little extra help. You can get somebody to give a tap as you're pulling on it from the other side. It just fits into a little groove there around this plastic knob.

Once you've got it out, you're going to go ahead and press in on this little tab. It will release, and we'll set our lights aside. We'll repeat this process on the passenger side. Now we're at the bottom side of the car. There's a plastic panel that goes up in the fender well, here. We're going to need to remove that, so we'll take a Phillip's screwdriver, we're going to turn the screw out a little in the center of this plastic clip. Then we can take a panel tool or a flat blade screwdriver, pry it down. Once you have the center out, pop that out, set it aside for re-installation later. You can just grab it and pull securely down. Set that aside, and we'll repeat that process on the passenger's side as well. Now we can see there's a rubber plug right here. We're going to go ahead and remove that plug. That's where our wiring's going to come through the floor. We'll just et this aside, we're not going to reinstall this, or you give it back to your customer. We're going to put a piece of nylon tubing or fish wire up inside there, and we're going to try to fish it out to the corner, so we can catch our wires and pull them down through. If you don't have any plastic tubing or a fish wire, you can use a piece of coat hanger, anything that's going to hold a nice stiff angle around the corners in there. Push our tubing up inside the car. Now we can go on the topside and attach our wires. You'll see there's going to be a grommet with some wires coming out of it. You're going to have your yellow and brown wire, it's going to go to your left taillight. Your red and green is going to go to your right taillight. The right's a lot longer, so we're going to tape that onto our piece of tubing. We can take our wiring, we'll push it back through the opening underneath this panel, and we'll start to pull our fish wire. Now we have a couple feet of the right side wiring attached, or pulled through the hole, we can attach the left side wiring with some tape to the other wire here, and we'll continue to pull it down through. Before we push the rest of our wiring through to the grommet, we're going to put our two sided tape that comes with our kit, apply it to the back side of the module. This is going to set back inside there and we won't be able to reach it once it's in there. Don't 00:05:03 pull the rest of the wiring out. Just reach in there, now just pushing your control box back in there, you want to make sure you keep out the white wire with the ground loop on it, so we're going to secure that the floor of the vehicle right there. We'll take the supplied self tapping screw and just place it in, as close to the back as you can. Then we'll tack it out of the way. Now we're going to just take our grommet, and we'll pull it into position. This is the red wiring that we're going to attach that large roll of black wire that's going to run to the front, to the battery. First, we're going to go ahead and we can run 00:05:55 our T-connectors to our lights. We've gone ahead and put a piece of tubing through the back of the bumper, so we can get our wiring to the other side of the car. We fed it through. Then we'll take our T-connector with the red and green wire, and we're going to tape those to the end of our fish wire. We'll push that in . and we'll pull it through. We went ahead and dropped a piece of tubing on both sides, to the bottom of the car, so we can attach it to our T-connector, and we're going to pull it up into place so we can plug it into our taillights. Caps 00:06:43 are connected, some tape. We'll go ahead and go to the topside and we'll pull our wire up. We'll get our wire up here, and get our tape off. Plug into our factory wiring. Nice tight snap. Then we'll plug this side to the back of our taillight. I'll just line it up with your taillight, snap it into position, and then we'll take a zip tie to keep the excess up, not falling down to the bottom of the car. Snip off the excess. Then we'll slide our light back into position. Once you get it lined up, give it a couple of taps, then we can reinstall our two screws, and we'll repeat this process on the passenger side. Then we'll take a couple zip ties. We're going to tie up our wires so they can't fall down or get caught in anything. We'll go to the other side and make sure that one's tied out of the way. Now all we have left is to reinstall these covers. These two holes here are going to push up on these two studs that are sticking out of the body. We can reinstall, then we'll take our red wire, I'm going to strip it back just a little bit more. Then we'll take our yellow inaudible 00:08:52 connector that's supplied with our kit, slide it on, crimp it up and take our roll of black wire, and we'll strip it back, as well. About a quarter of an inch. Slip it into the other side. Once you do that, give it a tug, make sure it's secure. We'll take a little bit of electrical tape and we'll wrap it up to keep any moisture or dirt out of there. Once we have it all taped up, we're going to run it to the front of the car. Now, so we've tied our wire together, we followed along the frame, onto this tube, when over the axle, just continue following all the tubing that goes across the bottom of the car. We make sure we stayed away from anything that was going to be a heat source or anything that could rub though the wiring. Your best bet is to follow the factoring wiring and your plumbing that's already at the bottom of the car. Then we came straight through the inside here, and we've tied it all along the fuel lines. We went up the fire wall to reach the top side of the car. Make sure you stay away from anything like your steering linkages or your exhaust system, which on this car it's on the other side, so you're okay, and any of your drive axles. Just, if you stay along the firewall attached to your, where your plumbing goes through, you'll be fine. Our last step. While we're still under the car, is to replace this other side little rubber cover, and we'll put our clips back in. That'll button up the bottom side of the car. As you can see, we have plenty of extra wire, so you can kind of take your ideas and run the wire wherever you wanted to run it. You do need to make sure that you do ties this onto the battery so it has a constant 12 volt source, and not tie it onto any kind of power outlet that might be in the back of your car, because you don't want to run it through your car's wiring system like that, and possibility cause damage if there was a spike. That's why you're running it clean power from the battery all the way back to our models. Now we'll finish zip tying up our wires. Now we're going to get ready to install our fuse holder. A nice round loop, you can cut it any place you'd like. I'm going to cut ours to an offset on one side, because I want to fish our wire up through the inside of this cover to attach it to there, and we have enough length to leave the fuse on the outside. We're going to strip it back about a quarter of an inch, then we'll do both sides. Put our bud 00:11:50 connector on the short side here, crimp it nice and secure. Then we're going to take our wire that we brought from the back of the car and figure out where we're going to need to be, about. Leave a little bit of excess. We'll trim off that piece. Same thing here, we'll strip back about a quarter of an inch. Attach the other side to the bud connector. Crimp it, then we'll take a little bit of electrical tape, and we'll wrap it around there to keep out any dirt and moisture. We'll take the long end of our wire, push it up through, now I can put our ring loop on the end. We'll take a 10 millimeter socket and take off the nut, and we'll place our ring loop on there. As you can see, it's a little larger than the bulb, so we'll put a washer on. Just a little flat washer. Then we can reapply our nut, and then torque it back down. Push it down, let it form around. Snap our cover back on. We'll take our supplied fuse, 10 amp, slide it in, push it in securely. We'll put our weather cap on. Then we can take our final zip ties. Now we'll be ready to test our system. We're going to be using the Curt Four Flat LED Vehicle End Tester, part number I26 that's available at our website. First, we'll test our parking lamps. Then our left turn signal. Then our right. Then you'll see two lights light up solid for the brakes. That's good. Now we're ready to go for a tow. That's going to do it for our look at and install of the T1 Vehicle Wiring Harness, with Four Pole Flat Trailer Connector, part number 118501 on our 2015 Hyundai Tucson. .


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