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Before you get wrapped around the axel trying to find this .5 amp drain, are you absolutly sure that your battery is 100% good???
I have seen batteries that start the car fine but if you leave the stereo on for 10 minutes it goes dead!
Please,,, take your car to a starter/alternator shop and let them check out the battery and the charging syatem. You might find that it's just the battery!
Keep us informed on what you find!
On the 84's, a common cause of this problem is the digital dash. My car will sometimes sit for weeks and not have a problem and other times will drain down in about 2 days.
I will be pulling the dash module and checking for bad solder joints and bulbs this weekend. I'll post the results.