ok this is theeasyest way to find a draw on your batt.
1) get a testlight
2) disconect the neg post of the batt and install the testlight between the cable and the neg post (it will light up if there is a draw)
3) pull the fuses one at a time to see if the light goes out,i would start with the fuseable link for the alt.
You know, I agree with all this but I want to add, that if the drain is slight it's possible that the test light will not light up enough to see it. I'd suggest using a volt/ohm meter and set a scale low enough to see any current passing.