Electrical HELP: Battery drain from rear fuse box

[fizeus]

Hi all,
My batteries are draining really fast. Today I had time to search for the trouble.
I've the standard dual batteries setup, so I disconnected one and placed a Amperometer on the second battery.
It reads 4.7 Ah of electrical absorption. It's a really high value considering that the frunk light and the dash clock are disconnected.

I've removed the fused one by one with no results until I've disconnected the top fuse located in the engine bay (I think it's marked with number 3).
It's circled in yellow in the photo.

It should be the defogger ...
can anyone help me to understand where is the problem and what to check ?

[Old H2S]

Pull those 2 big relays one at a time and see if they are bad and stuck/burned in the "ON" position or grounding to -
Also check the switch above your radio by pulling out the Speedo and sticking your hand in and to the right to get to the back side.