Don't have an Outback -- but have a Forester and Subaru is pretty standard in how they do things. On my Forester, you lift the fuzzy trunk cargo liner and look toward the right rear tail light
assembly. There should be a connecter back there on a cable probably wrapped in a type of plastic tape. That's what you are looking for. There is a harness you buuy that plugs into that connector. You run the harness up through a hole in the center of where the spare tire is stored -- there should be a rubber plug in the hole for you torun the cable through. You can buy the cable from etrailer.com for about $29 -- Subaru will chage about $100 for the same cable.
This only gives you a 4 pin cabability. If you are going to use electric brakes
you'll need a 7 pin connector. You can get them that the 4 wire conector plugs in to -- but that only gives you the lights
. You are going to have to run wires from the driver's side interior for the signal from the brake controller (installed separately) and the charging circuit for the RV battery
while the trailer is plugged in to the connection.
It's not hard to do yourself -- an RV place will probably charge about $300 for a brake controller, wiring it in, and running wires back to the 7-pin.
If you don't need electric brakes
and are just looking for lights
-- the description in the first paragraph should be good enough.
Did a search on etrailer.com. Here is the website. It shows the harness you need and where the connector is located inside the car:
But this was for an Outback WAGON -- if he has a SEDAN then there is no connector back there and the harness has to be hard-wired (this is where it starts getting more difficult). See this link: