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Trailer Wiring Harness Installation - 2009 Subaru Forester

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How to Install a Trailer Wiring Harness on a 2009 Subaru Forester

Today on this 2009 Subaru Forester we are going to be installing wiring harness part number 118467. We are at the rear of the vehicle and the port that we are going to need to plug our wiring harness into is located inside the cargo area underneath the floor board over here on the driver side of the vehicle. We are going to need to remove quite a few pieces to gain access to the port. The driver side styrofoam has a few retaining fasteners holding it in to position. To remove those you can either use a flat headed screwdriver or you could use a rivet removal tool. 00:33

With those two fasteners removed we can remove the styrofoam section on the driver side and with that removed we can see our port that we are going to be plugging into. It is located right here. With the port located we can take our wiring harness and plug it in line. We want to make sure that the main fuse is in position as well. You can see we do need to mount the modulite box that has double sided tape on the back side. What I want to do is make sure that the surface area is clean that we are going to be adhering to. It might not be a bad idea to take a light solvent and clean that off first. Then just peel back the covering on the tape and adhere it to the surface area. 01:18

With our box mounted I am just going to take some of the provided zip ties and just tie the wiring to this main harness. With the wires tied up out of the way we can start reinstalling the interior. What we are trying to do, see we have got our 4-pole, we are going to run it out the opening in between the interior panel and the styrofoam. Again we just want to reinstall the rivets that we had removed earlier. From there, essentially our installation is complete. When you want to use the harness just pull it out the rear cargo door and make our connection to the trailer. You can close the door on there, the weather stripping at the threshold will prevent the wiring from being pinched so you do not have to worry about that. With that, that will conclude the installation of wiring harness part number 118467 on a 2009 Subaru Forester.

Tom H.


The connection is corroded. Both sides of the connection the wires pulled out. Is there an easy way to fix it?

Etrailer Expert

Jon G.


If it's just the 4-Way on your vehicle then I would just cut it off and replace it with part # 20250 which comes with heat-shrink butt connectors. To keep the connector in good shape you'll want to add some dielectric grease # 11755 every so often.

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