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Sounds like they were referring to the OVP or OverVoltage Protection relay.
This relay is designed to protect the sensitive components should there be a voltage surge or someone crosses the jumper cables during a battery charge, for instance. It's not likely that this is happening though.
As stevebfl said, there is no accessory that draws that much current besides the starter. Anything drawing that much because of a short circuit or crossed wires would result in a fire!
Do you happen to know which fuses were disabled (i.e. what assesorries would operate if the fuses were replaced)?
Finally, does your car have any aftermarket accessories installed? I had a vehicle with an aftermarket alarm in which a faulty brain drained the battery in a few days...
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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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