Parasitic Drain

Hey fellow nova owners, i bought a 69 nova and my battery keeps dying. I had the battery tested and it was still good. I tested the alternator and it was shot so i bought a high power alternator. Now my battery is still draining if my car sits for over 24 hours. I measured the current and it was reading 27 mA while the car was off so I believe I have a parasitic drain. I was wondering how I go about fixing this. Please reply. Thanks 4 the info!

Check this out I found this by doing a search, could help if your tryed it.

http://www.autoshop101.com/trainmodules/batservice/117.html