OK...here's the easiest, most visible way to track down an electrical 'leak'. Make up a low-wattage test lamp from bits at RatShack. Disconnect the battery ground and connect the test lamp between the battery terminal and the ground strap. The brighter the light the bigger the drain.
Now start disconnecting components, like unplug the alternator, as a bad diode or diode pack could be the source. If thre light goes out, you've found it. Mind you, there will always be some current drain, from things like the clock, but the draw is so small, the bulb will barely glow. This technique is low-tech, quick, and easily visible as you pull fuses or wahtnot.
Cheers