Welcome to the forums. Wiring diagrams can be found in the threads concerning electrical systems. At the top of the page click on "Click to go to forums interface" and scroll down until you find the topic you are interested in. There are two distinct systems in your A/S, 12v
DC and 120v AC. Each one has its own diagram. There is also a separate diagram for the wiring for you tank monitor panel if you have one. It's good to learn about both systems and how they are integrated to power your trailer and it is good to learn how to use the forum resources rather than having to wait for a reply for your questions.
Oceandog, I hope you do not have a 120v wire in contact with some part of the trailer. A similar situation can come about if the polarity is reversed at the power plug or if an outlet or switch is wired incorrectly. A polarity checker can be obtained pretty inexpensively from any hardware or big box home center. I would try that out first. Checking the power source first, then if you are using an extension cord, check it also if isn't a three prong plug. If that checks ok, then plug in the trailer and start checking outlets. It's pretty common for someone to replace and outlet and wire it backwards. Also check if you have aluminum wiring. If so make sure the outlets installed are designed for use with aluminum wire.
BaltiHimel- I used to live in North Bend before everyone in Seattle found it. Nice to be in the shadow of Mt. Si. Your wiring diagrams should pretty close year to year depending on what model you have rear bath, center bath, etc. The 12v
system is the most complicated and once you know what color wire goes to what fuse its pretty easy to figure out. Forgot about tanks. What tank is leaking? If it is the water tank check the filler for a bad connection also I overfilled mine the first time and had quite a bit of water get into the belly pan which then leaked out. I thought I had a leak but not so. Depending on your trailer the tanks are in different locations. If it is a rear bath like mine both black and grey water are located in back and fresh water is located above the axles.