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Take off the negative battery cable and install a multimeter in-line on AMP setting using alligator clip jumpers.
-That's the total parasitic draw. Key Off, Engine Off.
-A 12V test light probe will work also for basic test purposes.
-If there is any current flowing, the connector will spark when tapped on the battery.
If juice is flowing, now find which branch:
1). Isolate the alternator by disconnecting it from the red positive cable. The battery is disconnected when doing this of course.
2). Isolate other branches such as radio, alarm, other by pulling respective fuses.
3). When something is disconnected and amp flow drops to zero, or near, you've found the problem.
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