Dennis is right for the easiest test first. Next, whether or not you see a spark, connect an amp meter between the terminal and battery post. Now you'll know how big it is, from fractional amps to several amps.
Since the electrical system is pretty simple, start by removing the fuses one at a time until the draw goes away. Now you know which circuit is the problem.
Got them all out and still there? Remember any accessories that have in line fuses.
Still not found? Now you just have the unfused circuits to look at.
Last edited by Jim Sears; 11/15/2014 1:57 AM.