OK, so something is def. not good here. I wasn't getting anywhere with the multimeter, so I tried the other method which someone forwarded to me, I put a 12v light between the negative cable and negative post with everything turned off. The light came on. This is supposed to indicate a current draw. I then proceeded to remove the fuses one by one to see which circuit the light went out on. It didn't go out at all. I even removed the backup, gas heater, and 2 other 30 amp fuses on my Westy. Light still stayed on. I took off the positive cable and removed the red + wire to the VW diagnostic plug at the back thinking it might be grounding, along with the other factory small +ve wire on the +ve cable that heads off into the wiring harness, then sat +ve cable back on the post. The light still stayed on. 
Where else can I check? I have removed every fuse in the van. Would REALLY appreciate some pro help here. I'm losing about 0.3 volts over a 16hr period.
Thanks,
Courtney