Hopkins Plug-In Vehicle Wiring Harness Installation - 2015 Hyundai Santa Fe

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How to Install a Hopkins Plug-In Vehicle Wiring Harness on a 2015 Hyundai Santa Fe


Clayton: Hello everybody, Clayton here at etrailer.com. Here at etrailer.com we install, test and review a lot of different products. To appease the customer and make a more educated decision before your purchase. Today, we're going to be working on a 2015 Hyundai Santa Fe. We're going to be taking a look at, and I'll show you how to install the Hopkins Plug-In Simple 4-Pole Wiring Kit. Our 4-pole is going to be essential to getting our lighting functions to our trailer or even our cargo carriers.

There are some cargo carriers out there on the market that do require a 4-pole. So this kit is going to be great for you. It's plug and play, super easy to get installed. This is what our 4-pole is going to look like installed. And one of my favorite features is that it does store inside in our cargo area.

So we don't have to have it attached to the hitch all the time and have to worry about it whenever we need it, simply pull it out and plug it in.One feature that I really like is everything is going to be included. So I don't have to try to tuck down extra parts or make sure that we have everything, simply take it out of the box and install it. So that's super easy to get that peace of mind. And I do like how it just uses our factory taillights. It's plug and play, super easy.

With that being said, I'll go ahead and show you how to get it installed. To start our installation, we want to work in the trunk of our vehicle. So we're going to come back here and clean out any of our belongings like we've already done. Then we're going to lift up on our threshold here. We can just move that out of the way.

We now want to remove our jack and flat tire kit here. And we'll just set this off to the side. As you can see, our vehicle already has a 4-pole wiring harness installed, but it is faulty. So we're going to take this old one out and replace it.But with everything cleared out of our lower compartment, we want to grab a small pick and then we're just going to lift up on these plastic caps. You can get these out of the way. You can also do this with a small flat-bladed screwdriver. There's going to be two on each side. Underneath those caps we're going to have eight millimeter bolts that we want to remove. Now, we actually just want to close our lid and move our wiring over. And then we can lift up and lift this whole plastic piece out of the way. And then we moved our wiring over, that way it just comes out of the hole on the side here. Just like that. And now we just want to unsnap our plastic threshold back here. Let's pull out and up, remove it and set it off to the side. We can now grab our pick and pry off the little covers for the hardware on our taillights and pry those down. Now we'll repeat that same process on the other side. We now want to grab a Phillips head screwdriver and remove our two screws that hold in our taillight assembly.Now I'll grab a nylon pry tool. If you don't have one, you can find some here at etrailer.com. This is going to help us get our taillight assembly out without breaking anything. So we're just going to stick it here, behind there, and simply pry out to remove our whole assembly. Now, examining here, you can see our old wiring harness plugged in. All you want to do for now is unplugged the one going to our actual assembly. We're going to push down on this little tab and then pull out just like that. We can set our assembly off to the side. And now I want to remove this Phillips head screw holding in our side panel. Just like that. And we can set our screw off to the side.Now we want to pull out on our trim. Now you don't have to do this, but it does make it quite a bit easier to work with once we actually get our panels snapped out. We now need to remove a screw behind this little tie down. We're going to take our pick and just pry out on our cover here. You can also do this with a flat bladed screwdriver. Here's that Phillips head screw. You can get that removed now. Since we already had the tools out to do this job, we want to repeat the same process on the other side.We're now ready to pop out our panel. Now you don't have to use a trim panel tool here, but it does make it a lot easier so we don't break any clips and push pins. We want to simply take our tool, just put it back here and pull out on our panel. Like I said, you do want to do that pretty carefully not to break any of our clips. Behind our panel here, there is going to be a small Phillips head screw. We can get that removed now with a slim screwdriver. And like I previously said, our customer already had a 4-pole harness installed, but if you don't just disregard this step. We just want to unplug our old wiring and then cut back our electrical tape and pull off our grommet.Now before we do anything else, we do want to disconnect the fuse from our old harness and just remove that 10 amp fuse. Now, like I said, if you don't already have one, you can disregard this step. We now want to cut our old power wire and we can pull up our old harness and wire out from the backside. With our driver's side disconnected, we'll move over to our passenger side and repeat that same process. I mean, now can throw away our old harness. We're now ready to grab our new harness. Our 4-pole part is just going to stay in our trunk. We do want to connect our power wire. And then our yellow and red is going to go to our driver's side. And the green and white is going to be run over to the passenger side, just like our old harness, or if you're installing it, it gets run behind our threshold.We are going to have this red wire that comes off of our box. This is going to be our power wire. Now you want to grab the red wire from our kit and just add it to this butt connector like so, and then we can grab our crimpers and just crimp that wire down. Now I do recommend after crimping it to add electrical tape, even though this is inside the vehicle, it is always good to play it safe and keep it secure.We now want to run our plug and our red wire out of the hole on our driver's side taillight, wherever we pulled our taillight off and disconnected our old wiring. To do that, we just want to grab our module, slide it behind our panel here. And then we will simply reach in and push all of this back through that hole. It is going to be tight, it's going to be hard to see, but we'll get the best angle for you. We'll start by pulling that power wire through. It is going to be tight, squeezing this stuff behind our body panel, but just take your time and be patient just like that. Now we just going to pull this not quite tight, but just to where there's not all that much slack.Now we'll follow that up by pushing our plugs through that same hole. With our plugs ran through, we want to grab the female part of our plug and we'll take our factory wiring and just plug that into here. And now we want to grab that grommet. We're just going to add that to our wiring here, just to keep everything protected from the elements, not only our wiring, but also the inside of our car, but if you're installing it for the first time, you just want to grab a utility knife and cut back our grommet and all the sheathing around it. And we want to grab our new wires and push that grommet over our new wires and add electrical tape just for added protection. You can also do this with zip ties then electrical tape later, but we're just going to do it with electrical tape because that's how it was before.We now just want to push our grommet back into our hole, containing all of our wires. We're now ready to ground our system. We're going to use our white wire with a ring terminal. Now we already have a hole right here that we're going to use, but we can use a self-tapper provided just to drill into our vehicle. You do want to make sure that it's out of the way and going to be protected, but also on a good surface. We can add our self-tapper and grab our Phillips head screwdriver and screw our ground into that premade hole.Our module is going to be contained right here. We can zip tie it to this factory wiring to keep it in place. We can now grab our green wire. We're just going to toss that to the side for now. Then we're going to grab our 4-pole end and just route that underneath our panel to where it comes out down here. Now all you have to do just to make it easy on yourself, Just pull up on this panel and tuck our wires underneath the plastic. This is going to keep it protected, but also we don't have to take apart the whole rear of the car to get our wires over here. So that's going to be nice. We can just tuck our wiring like that and leave it there for now. At this point, we can just snap back in our panel. We're just going to pop that back into those according holes, just like so.And we can reinstall our hardware in the reverse order we took it apart. And as I've mentioned a few times since we did already have that 4-pole wiring done, we already have our power wire ran from the rear of our vehicle up to our battery. So we're going to make our connection here, but I'm going to show you how to run the power wire safely and to keep everything out of the way of hot or moving parts. And if you did already have the 4-pole like we do here, we're going to connect the new power wire to the old power wire. We're just going to cut that right about there. And we're going to strip it back pretty far because we're going to double it over since our old power wire is quite a bit bigger than our new one.So we'll strip that back and grab a heat shrink butt connector. As I said, we're going to be using a heat shrink butt connector. If you don't have any, you can find some here at etrailer.com. Like I said, we're going to twist this and then just double it over to give us a little bit more width in our butt connector. We now just want to crimp that onto both ends. Now we're just going to add some electrical tape to ensure that's going to be water tight, to drop our power wire from up here down to the bottom of our Santa Fe, we're just going to grab an airline tube and push that down through a hole and then pull it down. We can also do this with a string or a coat hanger, really whatever you have available to give you that extra leverage underneath to get our wire pulled through. With our connections made, we're now ready to reinstall our taillight. We'll just take our plug and plug that in to our taillight housing.You hear a nice click knowing that it's in place and we can just re-install our taillight assembly in the reverse order that we took it apart. We're now ready to run our green wire over. All they we're going to do, just this underneath our trunk foam. If you're having trouble doing this, you can grab a trim panel tool just to help push that wire down underneath, just like that. Now we just want to pull out on our side panel again. We're going to push our wiring up through this access hole in the bottom. Then we'll catch that on the backside. And we'll route that into our taillight the same way that we did on the driver's side.We just want to pull that wire nice and tight, you always come back later and hide it. We now grab our factory harness and plug the female end into it. Give it a little tug to make sure it's secure. And we'll push our green wire back into our Santa Fe and then add our grommet just like we did on the other side. We'll re-install that grommet using electrical tape again. Now we can just take all of our wiring, push it back and install our grommet. We can now reinstall our taillight assembly.Now ready to re-install our rear threshold in the same order we took it apart. If you're having trouble getting it to line up, I just pulled this gasket off, that's just going to help get everything lined up how it was factory. With that all snapped in, we can push our gasket back on. We can now grab the box that we removed from our trunk. We're simply going to push our wiring harness into that opening on the side where the old one was. And then we will drop it down into place. Now you do want to take one side, lift it up and then we can just pull our harness through and wiggle it around just like so. Now we can re-install our bolts. This is where our wire dropped down and we're going to come back and zip tie it to, through our factory wiring. And we ran it up and over our rear sub frame. And then it comes out right here.And like I said, you do want to keep out of the way of anything hot or moving. It comes out right here and then runs down the side like so. And then comes out right here. And it goes under our factory channel, right through here. And then up the side of our firewall. This is where our power wire came up. We're just going to use an airline tube to pull up our power wire. Now we want to strip back this end just like so. Now we can crimp on our fuse holder. We can go ahead and now heat shrink this down.Now we can add some electrical tape just to ensure a good connection for a long time. And it is good to do it while it's still warm. That way it helps adhere the electrical tape to the butt connector. We now lift up our battery cover and we're going to be using this nut right here. You can get that removed using a 10 millimeter socket. With that removed, we can grab our fuse holder. We'll just slide our ring terminal on there. And then re-install that 10 millimeter nut. We're now ready to add our fuse to our fuse holder.We'll simply just push that into the prongs. Make sure it's seated all the way down and add our cover. Now, before we test everything out, we just want to clean up our wires. With everything tidied it up, all we want to do is just push that down behind our battery. With our 4-pole harness plugged in, we can now test it out. And if you did want to pick up a 4-pole testing harness, you can find one here at etrailer.com. To start we'll do our brakes. And then our left turn, our right turn and our running lights. Our kit does come with dielectric grease, so we do want to make sure to add that to our fans and our connector. With our dielectric grease added, we can now add our boot. We'll just slide that over like so. With everything tested and our dielectric grease added, we're now ready to hook up to our favorite trailer and hit the road. That's going to do it for our look at and the installation of the Hopkins Plug-In Simple 4-Pole Wiring Kit for our 2015 Hyundai Santa Fe.


Questions and Comments about this Video

Info for this part was:

Video Edited:
Joshua S
Video Edited:
Chris R
Installed by:
Cole B
Video by:
Jonathan Y
Test Fit:
Clayton O

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