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Trailer Wiring Harness Installation - 2008 Kia Sedona

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How to Install a Trailer Wiring Harness on a 2008 Kia Sedona


Today on this 2008 Kia Sedona we are going to install part number 118410 from Tow Ready. The first steps involved is get into the back of the vehicle, pull up the hatch, and then get to the fasteners that hold the tail lights in place. We have got three fasteners to remove and then pop the light off. Now we will disconnect the tail lights from the wire harness. Push down this little tab and this connector will come apart. Now we will go over to the passenger side of the vehicle and do the same thing one more time. 00:36

We are going to start working on the install now with the T-One connector. First we will take our 4-pole wiring harness and we are going to it down below and pull it out below the bumper. Next we are going to remove this little plastic screw right here just to give us a little working room so we can have a nice place to hide our module. There is barely enough room but I think we can install our module. Attach it to the sheet metal behind the bumper cover. We will leave it like that for now. 01:07

We are going to take one half of the T-One connector with the green and red wires and we are going to go down below just like we did before. The next thing we can do is plug the T-One harness into the factory harness. We will set that to the side for now and we will take our white ground wire and attach it to the sheet metal right here. The next wire we are going to deal with is a black wire, a 10 gauge wire that will be ran up to the battery up front on the vehicle. Again we will this through and pull it out through the bottom. The other end of this wire will attach to the red wire here for the module. We are going to use a butt connector to connect everything together. Since this is going to be sitting outside lets wrap some tape around it. Put the little plastic rivet back into place and then we can reinstall our tail light. To help hide our wire as it goes across the back of the vehicle we are going to remove these plastic rivets here. One, two, three, four of them to go across. There are metal brackets that the bumper fascia attaches to and we are going to stick the wire between those two pieces. 02:39

We are going to start off with the green and red wire and we are going to tuck it up behind the fascia behind the metal bracket where it attaches and we are going to work our way all the way across to the other side. We will do the same thing with our 4-pole flat. Tie that off to the chain loop for now. Now we will reinstall the fasteners. Next we will tie off our excess 4-pole wire. There is really not much to tie off to but you are going to make a small hole in the bottom of the fascia to have something to tie off to. Next we are going to take our wire and just poke it down, wrap it around the T-One harness, and pull it back up. Pull up the wire, make sure it stays away from the exhaust on the bottom. Take up the slack and then we will use a zip tie to take up the slack and hold everything in place. The same thing as on the driver side, on the passenger side we will snap our connectors together and reinstall the tail lights. We will start running our black wire up to the front of the vehicle. It is kind of hard to get around the suspension components but what we did is made a hole in the interior of the fender well and ran our wire through. We went along side the suspension coil and then went over the other suspension components and then went along the parking brake cable up front and then we continued up front underneath the firewall of the vehicle and then we will pull the wire from the bottom to the top. 04:59

To pull our wire from the bottom to the top in the engine compartment you can see that the engine compartment is pretty full so what we will use is a piece of wire with a hook on the end to reach down and grab it and kind of help pull it back up to where we actually get to it with our hands. Then we will route our wire behind this component, around the fuse and relay block, and work your way around to the positive side of the battery, and then we will make our connection point here. We will cut our wire to length, the black wire, and then we will take the fuse holder and cut it in half. Then we will connect the two together with a butt connector. On the other side we will install our ring terminal. Now we can start working on connecting to our battery. First off we will disconnect the ground, now the battery is safe to work on. We can use this terminal right here. Then do the negative terminal. Now all you need to do is put the fuse in the fuse holder. Now tuck the fuse holder right next to the battery safe and sound and then we will replace the cover. Everything is installed, lets try it out with a light tester before we try it out on our trailer. Hook the ground to our ground pole here. Next we will check the running light circuit which will be the brown wire. Now try the left turn signal and then the right turn. Then we will hit the brake signal so it should be yellow and green steady. It looks like we are good to go. That will finish it for part number 118410 from Tow Ready.


Info for this part was:

Employee Joe V
Test Fit:
Joe V
Employee Nicholas E
Test Fit:
Nicholas E
Employee Shane H
Test Fit:
Shane H
Employee Andrew K
Video by:
Andrew K
Employee Kathleen M
Video by:
Kathleen M
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Mike H
Video Edited:
Mike H
Employee Dustin K
Video Edited:
Dustin K
Employee Cole B
Installed by:
Cole B

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