2000 Toyota Camry battery drain

I imagine I will be getting to that method if once I get the IR Thermometer, and am still unable to find anything. My concern with the IR Thermometer, the focal point may be too large to be of much value in a crowded fuse box. What would be of real help would be a IR camera. As it is intermittently drawing (I’m guessing here), between 10 and 15 amps, I should be able to find some heat somewhere there shouldn’t be any! Thanks for the input.