Frank you might try this (I have heard people use it to find shorts). Take some type of device like a seat belt warning buzzer and hook it up between the battery and the positive cable. As long as the drain is happening it will "buzz". Now just go through your fuses and pull one at a time. As soon as the bussing stops you have identified the ciruit that the "drain" is coming from. I have never tried this but is sounds good to me. Good luck and keep us posted.
