85 5k battery drain

[DGraber460 at aol.com]

My daughters 85 5kt (non quat) has had a dead battery every 3 days. I had the 
battery checked which shows fine. Once fully charged, the car starts and runs 
fine and shows no alternator light. I therefore feel the alternator is not 
the culprit.
I remember a post that suggested pulling a battery cable and hooking a 
voltmeter in line and pulling fuses till the meter shows zero. When I tried 
this, the meter read 12.54 volts with no change as each (and all) fuses were 
pulled.
Am I correct in thinking that this shows a drain on the system?
If so, what could be another method for diagnosis?
TIA

Dennis
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