So you connected your test light in series with the negative terminal and negative cable and it never went out? I'd like to know what the actual drain is measured with an ammeter. If you pulled all the fuses, I believe there are some fuseable links in those cars so you may want to trace those out, iirc they're not far from the battery.
Now let me just state that I have been burnt by assuming, so I would strongly recommend that you test the battery and alternator for proper operation. That doesn't mean stick a volt meter to the battery, have it load tested.
I also wrote this, perhaps you should read it, http://www.columbusracing.com/forums/showthread.php?p=1656240#post1656240