RV Repair: Tent Trailer Wiring, dutchman tent trailer, jeep wrangler

Question
You wouldn't happen to have sceth of the wiring or a diagram would you. The easy part seems to be setting up the trailer battery to charge. The trickey part appears to be how to connect the trailer battery to the trailer so I can have power.
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Followup To

Question -
Hello,
I have a 97 Dutchman Tent Trailer. We bought it used last year from and older couple. When I bought it, I noticed that there was a battery attached to the trailer. Problem is, it isn't connected to the trailer or the tow vehicle wiring. The battery is simply attached to the trailer in a plastic battery box. I am new to having a trailer but it appears that the trailer does have a converter or what I assume is a converter. Located inside the trailer, there is a switch for battery or regular power. I would like to figure out how to connect the battery to the trailer so I can run the interior light and also be able to charge the battery with my town vehicle. I diagram of the wiring would greatly help. I know enough about wiring to set up a coil, stereo, and basic trailer wiring. My tow vehicle is a Jeep Wrangler if that means anything. I also would like to know what you can actually run using a battery and yes it is a deep cycle. My trailer has an A/C unit and an electric heater for whatever reason.  
Thanks for any help

Answer -
Hi Corey:
Most trailers have both 110 volt AC wiring and 12 volt dc wiring. They are normally wired as seperate circuits without sharing any wires. I suppose one could wire the circuits to share but it would be pretty tricky. The only conection for the two is that the converter is powered by AC and the output is DC to charge the battery. I doubt that you have an inverter to make AC from DC. In order to charge the trailer battery from your tow vehicle you have to install a continuous duty relay that hooks the two batteries
together when you are driving and then unhooks them when you stop so that you cannot discharge the car battery while using the trailer. The solenoid is staright forward to hook up. There should be two large terminals, one goes to the car battery positive the other to the trailer positive. These would be at least #8 wire. The wire to operate the relay comes from the ignition circuit of the car so that there is voltage there while the car is running and no voltage when you turn it off. You also usually put in a 50 amp auto reset circuit breaker in the charging circuit and a 10 amp fuse for the relay control voltage. You have about 120 amp-hours of storage in a battery. Each lamp you run at night draws about three amps so if you are running three of those or 9 amps you will draw 9 amp-hours out of the battery each hour. Once you draw out about 1/2 of the total storage of the battery the battery voltage will start to drop. At the 9 amp-hour rate thats give you about 6 hours or so. You can similarly figure out what other things will do to your battery. Good luck.
Bill

Answer
Corey:
It would be difficult for me to give you a scetch since I do not know what and where you want to hook up. A DC circuit needs two wires, a hot (+) and a ground. Normally you would run a large wire, #8 or #6, to a fuse block for the hot and a ground block for the ground. These blocks would have 6 to 10 spaces for individual circuits. You would then run #14 or #12 wire circuits from the blocks to the individual items you want to power up. You put a switch in the hot side to be able to turn things on and off. Good luck.
Bill