bing tracking image

Trailer Wiring Harness Installation - 2014 Ford Explorer

content loading

How to Install a Trailer Wiring Harness on a 2014 Ford Explorer


Today on our 2014 Ford Explorer we'll be installing the Curt converter box with a hardwire kit and a 4-pole end, part number 56146KIT. We'll begin by opening up the rear hatch of the vehicle. Next we're going to start over here on the driver's side where we'll need to remove the tail light assembly from the vehicle. To do that, we'll need to remove these two covers here, small flathead screwdriver underneath the cover will allow it to be removed. Once each of the covers are removed we'll need to remove the two screws that are underneath it; one underneath each cover, one there and one there. Once you have both of the screws removed we can go ahead and slide the tail light assembly away from the vehicle. Go ahead and take our tail light assembly and set it aside for right now. Next we're going to need to use our test light and figure out which wire goes for which function.

Now, we have the running light circuit on right now. As you can see it's lit up in here as well as over here. This top little clear section here is actually the reverse light so we won't be tying in with any wires from that, as well as the center section, down here is actually the blinker circuit. Now with our running lights on, we'll go ahead and test a couple of the wires here on the back side. Now that we've taken our test light we've determined that either one of these two yellow wires here can be used for the running light circuit. Now we've gone ahead and turned our blinker on. Now we've connected in with the purple wire.

As you can see here that's the wire you want for the turn signal, it's the purple wire over here on the driver's side. Next we'll go ahead and check for the brake signal. We'll go ahead and connect in with this brown wire here, let off the brake, step on the brake. As you can see here, for the brake signal we're connected in with the brown wire, let off. Now we know which color wires we have for over here on the driver's side. Either of the two yellow is for the running light circuit.

The purple wire is for the left of the driver's side turn signal, and the brown wire is for the stop signal, or the brake light signal. Now we'll go ahead and repeat the same process over here on the passenger side as far as tail light removal. We'll go ahead and turn the passenger side turn signal on. We'll use our test light again to check and see which wire it is. Now with our turn signal on, go ahead and take our test light. We're going to touch the purple wire again over here on the passenger side for the turn signal.

As you can see here it's blinking. For the passenger side turn signal, we'll be connecting again with the purple wire. Next we're going to take an old piece of air line tubing and use it as a pull wire. We're going to feed it down here behind the bumper cover so that it comes out underneath the vehicle. Now we'll go ahead and pull our pull wire out. Next we're going to need to take the long black wire that comes with the kit, strip a little bit of wire back, and we'll be connecting it with the black wire that comes off the converter box. We'll do that using the supplied butt connector. Now with our two wires connected, we'll go ahead and wrap it up with a little bit of electrical tape to help protect it. Next we're going to go ahead and take a paper towel with a little bit of rubbing alcohol on it and clean the back side of our converter box. We'll then be taking the two-sided tape supplied with the kit and attaching it to the back side of the box. We'll go ahead and peel the backing off of one side of the tape. We'll go ahead and press it firmly to the back of our converter box. Next we'll go ahead and take these four wires here and tape them off to our pole wire so we can pull them up into the tail light assembly area on the driver's side. We'll go ahead and use our pull wire to work the wires up behind the bumper cover. With our wires pulled up into position, we can go ahead and disconnect the pull wire, or the piece of air line tubing that we used. We're going to go ahead and take a razor knife and take back a little bit of this black tape, keeping the wires bundled together from the factory harness. Now with our tape removed a little bit, it will give us a little bit more working room to tie our wires in to the factory harness. Now to connect our wires together, we're going to be using these quick splices that come with the kit. We'll start out with our turn signal, so we'll start with the yellow wire from the converter box, and the purple wire from the factory harness. Go ahead and put the wires in making sure that everything's in all the way. Go ahead and take our pliers and squeeze down on the metal clip that's in the middle of the quick splice. We can then take the cover and snap it down into place. Next we're going to take the brown wire, which is the running light circuit, from the converter box and we'll be tying that in with the yellow wire on the factory wiring harness. Now you'll notice up here there's only one yellow wire. It splits off into two down closer to the tail light assembly. We'll be tying in with this yellow wire right here. This will be for the running light circuit. Go ahead and squeeze this quick splice closed as well. We can put the cover on that one. Next we'll go ahead and take the red wire from the converter box, now that is the stop signal, or the brake light signal, and we'll be tying that in with the brown wire from the factory wiring harness. We can then go ahead and close that one as well. Once you have all your connections made, you can go ahead and take some electrical tape and tape it up to help protect it from the elements. Now with our wires taped up, next we're going to need to attach our ground wire which is the white wire here with the ring terminal on it. Go ahead and use the self tapping screw that comes with the kit to attach the wire. Now we can go ahead and re-install the tail light assembly on the driver's side. Next we're going to take a paper towel again with some rubbing alcohol on it and reach up here underneath and clean the surface area where we can attach our converter box. Next we'll go ahead and take our converter box, we'll peel the backing off of the two sided tape. Then we can adhere it to the area we just cleaned up here. Next we'll go ahead and take a zip tie, we're going to go through this little hole right here, secure the wires to the underside of the car. Now we have three different sets coming down. This green wire here, we're going to route over to the passenger side tail light assembly. The black wire will go up to the front of the vehicle to connect to the positive side of the battery. Our four flat wiring will route to the center of the vehicle where the hitch is located. Now this green wire that runs over to the passenger side, we found is going to be a little bit short. We're going to go ahead and add the piece of wire to our green wire using a heat-shrink style butt connector. Go ahead and crimp that on. The butt connector we'll be using is part number Dw05744-5. We'll go ahead and take our extra piece of wire, our extension piece, go ahead and strip that back some too. Crimp that in to the other end of the butt connector. We'll then take our heat gun and seal up the butt connector. Now we'll go ahead and take our green wire and we'll route it over to the passenger side. You may need to use a few zip ties along the way to help secure the wire. Now that we have the wire over to the passenger side, we'll drop an air line tube down from above to use as a pull wire to pull our line up into the tail light assembly. Go ahead and tape our green wire to our pull wire, then we can pull it up into position. We'll go ahead and take a zip tie, zip tie our green wire to the factory wiring harness to help keep it pulled up nice and tight. We can also go ahead and trim our green wire down some, and we can also trim off the excess zip tie. Next we'll go ahead and take our quick splice, where we'll attached our green wire to the purple wire from the factory harness. Go ahead and squeeze the quick splice down, then we can close the cover, and we'll add a little bit of electrical tape to protect the connection. Now we can go ahead and re-install our tail light assembly. Next we'll go and take our four flat wiring's and we'll route it over to the center of the hitch. We'll then go ahead and take the rubber covering that comes with the four flat wiring, we'll install it on the four flat, take the other end, and go through the safety cable loop, and hook it back on to itself. Now we'll take any excess four flat wiring and secure it using a couple zip ties. We can then go ahead and trim off any excess zip tie that we may have used. Next we'll need to take our black wire and route it up to the front of the vehicle into the engine compartment. Next we'll go from the top side of the engine compartment, again using our old section of air line tubing as a fish wire, go ahead and route it down where we'll be connecting it to our black wire underneath the vehicle. Go ahead and tape our black wire to our pull wire. Now we'll go ahead and pull our wire up into the engine compartment using the pull wire. Next we'll take a zip tie to secure our wire up nice and tight here in the engine compartment. Next we'll open up the cover here on our positive side of the battery. Then go ahead and take our black wire here, we'll need to trim that down to length, and we'll be adding in this fuse holder line. We'll get an idea of, our fuse goes to there. Go ahead and give ourselves a little bit of extra. Go ahead and trim the black wire down. We're going to take our wire strippers and we'll strip a little bit of wire back. We'll then take the yellow supplied butt connector and add it to the end of the wire. Then take our fuse holder, strip a little bit of wire back from both ends. One end we'll be connecting here with the butt connector, the other end we'll be adding in the supplied ring terminal. Then we can go ahead and tape up our butt connection here. We're going to be connecting right here on the positive post. Before you make the connection, it's a good idea to make sure that the fuse is not already in the holder. If it is, go ahead and remove it. Now, we're also going to snip the center section out of this ring terminal because that nut does not come completely off. We'll go ahead and loosen up the nut and slide our ring terminal underneath, then tighten the nut back down. We can go ahead and add our fuse to our fuse holder. Once that's in we can go ahead and put the cover on it. Now to close your cover, we'll go ahead and take the wire and bend it back that way so it follows the contour, then you can close the cover down. We'll then use a zip tie to secure up any excess wiring. We can then trim off any excess zip tie. We'll then go back underneath the vehicle and trim off any excess zip tie. Now we'll go ahead and take our tester, we'll connect the ground from it to the white wire which is the open prong here on our four flat. We'll then turn on our running lights. We'll touch the brown wire for that. Now our left turn signal, touch the yellow wire. The right turn signal, we'll touch the green wire, and the brakes we'll touch both the green and the yellow. You can see here all of our functions are working just fine. That will do it for the installation of our Curt trailer wiring harness, part number 56146KIT on our 2014 Ford Explorer. .