etrailer | Trailer Wiring Harness Installation – 2008 Lincoln MKX

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Full transcript: https://www.etrailer.com/tv-install-trailer-wiring-2008-lincoln-mkx-118551.aspx
Today on our 2008 Lincoln MKX, we’ll be installing the Tekonsha T-One vehicle wiring harness with 4-pole flat trailer connector, part number 118551. All right. When we’re ready to hook up our trailer and we’ve pulled our siring out of our trunk, all we’ve got to do is make sure our wiring is off to the side away from our trunk latch, we can shut our hatch, and e have a nice, ready-to-use connection down here to hook up to our trailer. We undo our dust cover here, hook up to our trailer, and make sure everything else is attached properly, and we’re ready to hit the road and tow our trailer. When we arrive at our destination and we’re ready to unhook from our trailer, once everything’s unhooked, we can put our dust cover back on here, open our hatch back up, lift up our spare tire cover here, place the wire inside, close our cover, and, as you can see, it’s up and out of the way. You don’t have to worry about it getting snagged in something when you’re loading cargo in and out of your trunk, just close your trunk and it’s like it’s not even there. All right, here’s what our wiring harness comes with. We have our module box here, which will isolate our trailer wiring from our vehicle wiring and eliminate any possible back-feeding of voltages from our trailer into our vehicle’s wiring, preventing any damage that may occur there.

We’ve got these T-connectors, which will tap into our wiring here on our driver’s side and then our wiring here on our passenger’s side. We have our 4-pole flat trailer connector here. We have where our power is going to hook up, which will run directly to our battery using this spool of wire here, this fuse holder, our fuse for the fuse holder, a couple of butt connectors and ring terminals to make our connections, and a self-tapping screw for our ground wire right here. We also have several zip ties to secure stuff up and out of the way, and we have some double sided tape to secure the box to our side of our vehicle. We begin our installation by opening our hatch. Then we will remove our tail light assemblies using two 8mm bolts here on both sides.

We’ll just pull them out towards us, wiggle them a bit, and it’ll pop right out. We’ll unclip the connector here. We’ll undo this one down here too, just so we can get the tail light out of our way. Repeat the same process on the passenger side. With our tail lights removed, we can now take out our trunk coverings here and set it aside. Remove our spare tire …

lift up on our spare tire surround on both sides. Now we can take off our threshold here in the middle. To do that we just pull straight up on it. Set that aside. Now we’ll take our grommet here for our tail light wiring and just pull it on out.

There we go. We’ll do the same on the passenger side. Now we’ll take a pull wire, just using a piece of old airline tubing we had laying around, go up through our grommet here. I’ll reach down behind our panel and pull to the side. All right. Take the tape off of the back side of our module and we’ll stick it to our floor over here in the corner so it’s tucked up and out of the way. That’ll work. Now we’ll take our yellow wiring here, tape it to our pull wire we dropped on down. Now we’ll take our pull wire and we’ll pull our connectors out through our grommet onto our pull wire. We’ll take our factory connector here for our tail light and we’ll plug it in to the male end here. All right. We’ll push in on it until it’s secure. You know it’s secure when you can pull back on it and it doesn’t release. Now we’ll take our grommet and we’ll cut a slit in it so our wires have a place to go. All right. We’re going to feed our black wire down behind our tail light between our bumper and the body of the vehicle so it comes out the bottom. We’ll pull our black wire on down. It’s sticking out from our tail light pocket; we’ll tape it to our pull wire again. We’ll go through the hole here that we went in with for our pull wire originally and we’ll reach up from behind our panel and pull it on down. We’ll pull our power wire into the vehicle. We can undo our pull wire. Take our end of our power wire, strip off some of the insulation. Take one of our yellow butt connectors here, install it on the end of the wire. Don’t need that much wire exposed. Crimp this down. Strip off a little more of the insulation on the black wire down here. We’ll install our power wire to it and we’ll crimp it down.