Battery draw / drain

[Gregs71]

Hi, i have a 2003 Tahoe. The battery is two years old and recently started going dead after sitting for a day or two. I checked the draw on the battery by disconnecting the neg cable an putting the leads on the negative cable and neg post. The reading starts at 5.xx. After 10 or 30 seconds it drops to 2.xx. it then drops to about 0.9 and then goes to 0.00. After going to 0.00 it starts jumping around to 0.9 back to 0.00 then to 2.23, etc. It bounces around in various intervals and to different numbers. My understanding is it should sit at about 0.03...
Tried wiggling pos and neg cables, engine block ground while numbers fluctuated th no noticeable reactions to the fluxuating #s... thanks in advance for suggestions.
Greg