How to track down whatever is draining battery?

VIIIup

Registered
Again, car is a backup ride only so it sits for weeks undriven. Usually only move it when getting my rock crawling rig out of the garage for a wheeling trip. If I don't disconnect the battery and it sits for 2-3 weeks the battery is dead, so something is draining it and I'm clueless how/where to start......suggestions.
 
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