Originally Posted by Herk7769
Without photos it is tough to give advice I think.
If you have only one battery and the only wires went to the current limiter and the frame, you should not be looking at a very expensive total replacement (except the battery of course).
Wire and terminals should be available at Home Depot or Lowes (bring a short piece to make sure you get the correct gauge. I think they are sized for 40 amps DC (8 gauge is OK for less than 10 foot run); 6 if longer.
You do not need to run it all the way to your converter (not "inverter" I am thinking - unless you had one of course); just to the current limiter under the frame.
Trace it back from the box and you should encounter current limiter, or a fuse, or a junction, or some other end of the line just under the front of the trailer. Measure from there to the box, add a little for slack and that's the length you need for the positive. Negative's probably even shorter. Mine goes to a bolt just below the box and into the frame. Maybe a foot total length, if that for mine.