How does one go about finding a parasitic battery drain?
Very good . Thank you. New battery. And so it begins.First step is to pull fuses one at a time and use a voltmeter to see if there's still current there, with the car off.
If you find one that's hot with the car off, there's your drain...track down that wiring and inspect/fix/replace it.
These can be a long, painful experience to find, but you're better off NOT paying someone else the labor hours to find it.
The most common one I've seen is the trunk light getting stuck on because of a bad wire.