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Trailer Wiring Harness Installation - 2017 Subaru Outback Wagon

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How to Install a Trailer Wiring Harness on a 2017 Subaru Outback Wagon

Today, on our 2017 Subaru Outback wagon, we're going to take a look at, and also show you how to install, the tow-ready T-One Vehicle Wiring Harness with the 4-Pole Flat Trailer Connector. Part number is 118467. Now, when we're ready for use, we're just going to drape it right over that weather seal there. That gives us a nice, cushioned area to keep it protected. You don't want to get it in the striker. That's going to cause damage. Like that, ready for use, connected to whatever accessory we've got back here we want to use it with.

When not in use, I like to just kind of bunch it up, and I'll use that dust cover to go around it, and that'll kind of hold it. That way, we won't have to worry about zip ties, or it just bouncing around loose. Now, this is what our wiring kit's going to look like when we pull it out of the package. This is a really straightforward, easy-to-install kit. We've got a factory connector that's located in the rear of our Outback. We'll show you how to locate that.

We're just going to plug this in. It's going to take the signals from our lights. It's going to run it into our converter box, where it's then going to be converted into a usable signal for our 4-Pole Flat Trailer Connector. That's going to work out really good with your cargo carriers, your trailers, whatever you have your need for. This gives us our right turn and brake, left turn and brake; it's going to give us our running lights, and also our ground, so we'll have a great connection. Now, in doing that, it doesn't draw any power from the vehicle's lighting system.

We've got a separate, 12-volt wire that runs into our box, so it's standalone power. This is going to deliver 2.1 amps for our turn and brake signals, and it's going to deliver 5.6 amps for the running lights. That should be more than enough to power any standard utility trailer. Ten-amp fuse is going to come with it. We'll put that in our fuse holder there.

That's going to keep our converter box free of any kind of shorts. It'll protect that for us. Then, they give us a couple zip ties here, if we need them, just to kind of tidy up our wires. Typically, though, with the way the floor lays out in our Subaru, we're going to run it under a panel, store it right there by our spare tire, and we'll be in great shape. We're going to begin our installation here in the rear of the vehicle. Going to remove any of the coverings on the floor, our cargo nets. We just want to clear it out. Want to remove this hard trunk pan cover. If we pop up on these side panels, you see that one's going to come out for us. Just lift up on that tray. We'll get that out of the way. Then, using either a screwdriver or a trim panel tool, we want to pop up the fasteners. We got one right here, and if we go straight forward in this little pocket, there's another one. Once those are out of the way, we can lift up, kind of pull out on that foam pad, and we'll set it aside. Now, we want to reach up right in this area, located just behind this tie down hook. Our plug is going to be taped in right up there to a wire loom. We'll just get that pulled out from underneath there, so we can make our connection. Right there. Now, we'll just take that plug. It's going to go right into the plug that we found underneath the trim panel there. Give it a good pull, make sure it's securely connected. Take our fuse and slide that in the fuse holder. You just lift up on this little tab here on the side, slide that in, and cap it off. Now, it's just a matter of tucking it right up underneath there. We can run it right around the back here, back to this point. Tucked in, be up and out of the way there for us. I like to turn the box to where the top is facing up, and then just rotate it up and under. That seems to keep it up and out of the way for us. There's not really a good spot to zip tie it off to anything, so that's going to be our plan of attack there. Now, we'll bring in the pad that goes here on the side. Little push fasteners back in there. I'm going to bring that 4-pole around, where it's sitting right where that hump is, or right where that raised edge is. We'll put our jack storage area back in, and then, right in that little gap, it's a good spot to run that 4-pole. That'll keep it up here in our storage area. I'll use that dust cover to go around it, and that'll kind of hold it. That way, we won't have to worry about zip ties or it just bouncing around loose. Now, it's just a matter of putting the rest of our floor coverings in, and we'll be ready to plug it in and test it out. Now, to run our test, we'll use part number I26 here. Started our running lights, do our left turn signal, our right turn signal, and our brakes. Now, with everything working properly, that's going to complete our installation of the tow-ready T-One Vehicle Wiring Harness with the 4-Pole Flat Trailer Connector. Part number is 118467 on our 2017 Subaru Outback Wagon.

Questions and Comments about this Video

Mark M.
I can’t figure out how one gets their hand in there without tearing up the cover! My hands are nowhere near small enough to reach the plug!
Etrailer Expert
Reply from Chris R.

The factory plug is definitely pretty hidden behind the cover - Randy (in the video) really had to reach in there. You shouldn't need to worry about the cover being damaged if you need to pull it back a bit to fit your hand underneath. It's strong enough.

Reply from Mark M.

@ChrisR I found another comment about using a 10mm socket to remove the anchor. This gave me enough room to reach the plug...barely.

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