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There are a number of different methods of wiring a vehicle for towing depending on what is required.
Your vehicle probably uses a CAN-bus system and great care must be used when wiring for towing unless a genuine Nissan wiring harness is used. What fuses used and where they might be is something I am unable to comment about.
Wiring for towing and the wiring and lighting of trailers, campers, caravans are notoriously unreliable and short-lived unless completed to a very high standard and superior materials are used. When there is a fault it could be caused by either and it is important to suspect both and test both independently.
The first step should be to eliminate the camper, trailer or caravan as a possible cause by either plugging it in to another vehicle or using a substitution or testing box or device.
I have such a box that is invaluable to people who tow. It allows me to test the vehicle wiring and the trailer wiring.
Alternatively you could try plugging a known good trailer onto your vehicle for test purposes. It it is decided the vehicle is at fault it usually pays to examine the inside of the socket first to check for corrosion. I recently encountered a socket that was full of water and so badly corroded a couple of feet of the wiring had to be replaced. - and it had happened in only a year...
The 8 wire plug on newer models is for trailer hauling. The wires give power to the following; break lights, marker lights, backup lights (as equipped) parking lights, electric breaks (larger trailers will have these) one wire is a ground, and, through a positive wire, will trickle charge your trailers house batteries also. There is an industry standard to wiring one of these plugs, so you should be able to purchase any "newer" style trailer (tent, tow behind or 5th wheel, or camper) and the wiring harness will be wired accordingly. Any RV shop or auto shop should be able to provide a schematic for the wiring if you require one.
Go to the auto parts store ... they have or can order for you, a special plug that you insert into your existing wiring harness that will probably include the standard trailer plug. There is an outlet at the back of your truck for this add on.
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With 4 prong and 3 extra, that will give you what you need for 7 prong for towing RV. If your not too experienced in that area, a mechanic at any trailer place, or hitch installation place or who knows RV wiring, should be able to do it for you in about 1/2 hr. or less. Testing the wires from your truck for what they do as in right , left, stop, running/taillights, etc is about the hardest part, and the 7 prong usually comes with what terminal does what.
Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info. With the tow package, there should be a plug under the dash... far left above the emerg. brake petal. The harness that plugs into it should have came with the truck, or you can order one to fit it. Did thew truck come with a 7 pin plug on the back? If not you can order one from the above mentioned site. They also have the wiring colors.
The connectors for towing wire harnesses on foresters are generally on the passenger side, below the rear taillight inside the cargo space. some require pulling up the foam block that is between the spare tire compartment and the taillight. Check where you replace the tailights from inside the car, if there isn't a matching connector hanging out there, check around the spare tire compartment, see if you can remove the carpeted foam block next to the compartment and find the plug under there.
Ask dealer if it has a towing package on it. If it does, you usually just pop fuse in under hood for electric brakes, and harness to adapt into is usually near or at rear bumper. Even if it doesn't have brake wire, you should still be able to install adapter at rear,for lights etc. which is available from dealer or auto supply places, then you may have to run electric brakes separate.
The socket should be beside the tow hitch. If not you will need to connect a socket and patch it into the wiring of the rear lights. Here is the wiring diagram http://www.western-towing.co.uk/acatalog/Trailer_wiring.gif