1999 Chevrolet Suburban

Electrical problem
1999 Chevy Suburban V8 Four Wheel Drive Automatic 130000 miles

I have a 1999 chevrolet suburban, and I keep on having a dead battery. I have changed out the battery twice and had the alternator tested which tested good. I do not know where else to go on this matter. I also thought that if I disconnect the positive on the battery and use a meter, by connecting the meter between the battery positive and the cable I might be able to see if there was a power drain somewhere. When I did this, I took the reading and then I started to pull fuses to see if it would change up or down, but nothing. Any help you could give would be greatly appreciated.
April 27, 2008.

Try below

Apr 28, 2008.