Sometimes electrics can be a pig.
I'd guess in this situation it'll require a setup that can monitior the system over a prolonged period.
I think if I recall correctly Snap On had a problem diagnosis with battery draw that required one of the better diagnostic units to be plugged into the battery system for 24 hours in the garage.
I'll have a thunk and see if I can recall where I viewed it.
Anyway it's still a case of monitoring recorded data until a spike appears.
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