Sorry for highjack thread.
I would add some more background to think about.
I have disconnect negative battery terminal from the earth and put amperemeter in between.
It shows leakage 0,5Amps flat which looks to high for me. Further to above I have disconnect maxi fuses ( 7x) from fuse box near battery one-by-one to identify the root leak. It does not help since base leak 0,5 Amps remains unchanged.
Further to this I have PTS heater with 74&76 fuses ( Sea as attached ) connected direct from positive terminal. I have disconnected it as well with no change to leakage. Further to this I have taken battery off, stripped battery tray and clean 2 earth straps ( 1x - negative battery pole to body, 1x - drivetrain to body ) and battery poles. Same 0,5 Amps available.
Going back to this 0,5 Amps. 0,5Amp*12V=6W capacity looks like a regular inner lamp.
So the questions are this 0,5 amps leak too high or not and if it is to high what to see further.