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Hopkins Trailer Wiring Harness Installation - 2015 Subaru Outback Wagon

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How to Install the Hopkins Trailer Wiring Harness on a 2015 Subaru Outback Wagon


And this is what your wiring harness looks like when it's installed. It normally stays inside the vehicle, but when you're ready to use it it drapes down over the back. It provides you with all the necessary lighting signals you'll need to keep you DOD compliant in all states which includes your left turn signal, right turn signal, tail lamps and brake lamps. When you're all done using your wiring it'll store inside your Subaru.We'll open it up and here on the inside, you could see that when we we're using it was smashed between our weatherstripping here, which is perfectly fine. It actually keeps our wiring in place, but it doesn't cause any damage to it. Here we have the module for our wiring harness.

What I like about this harness having a module is that the module monitors all the lighting signals from your vehicle.And then the box here will produce that signal and send it down our 4-pole flat connector. What's nice about that is that if there's any faults on our trailer, the module here will detect that and it will shut the circuit down. In the event that it's unable to shut the circuit down, it has an inline fuse that would open up, which would prevent any harm from happening to our factory wiring on our vehicle.If you want to leave your wiring outside the vehicle Hopkins has provided a dust boot that simply just slides over the connector. And this way you can cap it off, keeping out any dirt and debris to ensure a long-lasting connection. You can also use it to keep it from bouncing around at the back, by looping it around your safety chain loop.

And when you're all done using it, it simply stores in your compartment here at the back of the vehicle.It's a quick and simple plug and play installation. Let's go over that now. We'll begin our installation at the back of the vehicle by opening our lift gate and then gaining access to our spare tire area because that's where we'll find our factory tow harness connector. Can pull your handling up, and we're just going to actually just poke this back, remove that on that one side there, we're also going to pull out the phone piece here.We're going to turn the foam sideways here so we can use this foam piece to keep our cover-up out of our way. There are two push pins that hold in the foam piece.

So we're going to need to remove those, to take those out. You can use a flat-bladed screwdriver to get underneath of them, but I recommend at this point that you use a pair of needle nose or a trim panel tool to get underneath of it and then pull it up. We're going to do the same thing with the one further back in this small little cutout area there.We can then take this piece out, move it over. We'll then come forward here you'll see these tabs going across, take your screwdriver below there and just kind of give it a pop. And those things will come right up.

This will give us access to our connectors located. If we lift up on this a little bit, you'll see there's a wiring harness and that grommet right there, some cabling. We reach up under here, we'll find our tow connector attached to this is.Just want to pull it off of there. Your factory connector here is going to be taped to the harness that we saw underneath coming out of that grommet there. So just pull this off of there and then bring it here to the rear or we'll plug our new harness into it. We'll now take our new harness and we're just going to simply plug it into our factory harness. At this point, our installation is basically complete. We just need to re-install the components in reverse order, how we removed them here at the back.But before you put all you're paneling back in, I highly recommend that you test the wiring out by either plugging it into your trailer or to a tester, which you can purchase [email protected] This way in case you do run into any issues you don't have to take all that paneling back out again to check to see what the issue was. So we're just going to plug it in there. You want to make sure that you have your left turn signal, right turn signal, tail lamps and brake lamps.I'm going to leave the wiring connector behind the paneling here on the side since it's pretty large. So just keep it out of the way for us. And then we can actually just run the wire down and we'll just leave it here by our spare tire. Because when you're not using your wiring this is where you're going to leave it. It is just going to store here in your rear compartment. You could secure the module, but due to the short lengths that they give you for your 4-pole wiring, I really don't even recommend mounting the module box.I would say leave it loose because when you're ready to use it, it's going to drape over the back here. And as you can see we have pretty much just enough length to connect to our trailer. This is going to be pinched between our weatherstripping right here at our wiring, with our module box still on the inside. Here you can see with it re-installed, I have the module tucked into this little spot here. It does seem to fit right there and it is a little short.So if your trailer doesn't reach, then you may have to, again, lead your module disconnected and in this area right here. So you can get that extra length. We're going to go ahead and do that because I feel like our customer here will have issues with his trailer reaching there. So we're probably going to end up just leaving it at about this position here, and this way we can ensure that we shouldn't have any problems plug in our trailer. And when you're not using it, the module and the wiring can just store here in your rear compartment.


Info for this part was:

Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
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Jacob T
Employee Chris R
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Chris R
Employee Kathleen M
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Kathleen M
Employee Dustin K
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Dustin K
Employee Zach D
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Zach D
Employee Jonathan Y
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Jonathan Y
Employee Cole B
Installed by:
Cole B
Employee Randy B
Test Fit:
Randy B
Employee Jared G
Test Fit:
Jared G
Employee Shane H
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Shane H
Employee Robert C
Test Fit:
Robert C
Employee David F
Test Fit:
David F
Employee Ryan G
Test Fit:
Ryan G

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