first, load test your battery to make sure it is holding a charge, and make sure all your main connections are clean and tight. also, get your multimeter out, disconnect the battery and bridge the gap with the meter to see what the actual draw really is. if its 300milliamps or less, you are fine and it's likely the battery. (i've had so-called "new" batteries crap out on me before)
if you are getting more draw than 300ma, leave the meter hooked up and pull every fuse one at a time and see which fuse corresponds with the draw disappearing. that will at least narrow it down to one circuit.
