"How to Test and Find a Parasitic Battery Drain (Key Off)"

I did not like the guys persona in this vid but he puts out the info in a logical and effective manner.
I knew how to do it but watched the whole thing and I did learn that vehicles can have more than one fuse box which I did not know.

https://www.youtube.com/watch?v=zdIKNnwEjIs

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84 300D, 82 Volvo 244Gl Diesel