Just as its stated. I need switched 12V in my trunk fuse box in my 2005 V6 S-Type. It's the base audio system and im adding a small powered subwoofer.

According to the schematic I have the 20A fuse #3 is supposed to switched but it's most certainly constant.

Any other ideas?

 

Figured it out. For what it's worth, I got it at the ignition switch. Remove the leg bolster and bottom trim around the steering column. Right behind the ignition switch you can see the wires which are actually detachable via an easily removable plug. In that plug is a white wire with a green stripe, that's your switched 12V.