strange voltage at fuses on the left of engine bay
 

I try to look for a good source (12+v) for a condensor fan and found a strange thing at the fuses on the left of the engine bay.
If you look at the 3 fuses bank (un-label), top one is blank, second one has 12+v at both ends when I pull the fuse off. Isn't this strange? I haven't tested the 3rd one.

http://loveporsche.dynalias.com/Cars...ge_Plug_01.jpg
http://loveporsche.dynalias.com/Cars...ge_Plug_02.jpg

Anyone know which wire around there is good for power source? Meaning it should be direct from the battery, or at least not too much devices used it already.