Needing to find a switched 12V fuse under the hood

Hi all. I installed fog lights and need to tap into the 12V power supply under the hood at the fuse box. All the fuses I have metered are 12Volt all the time which makes sense. The trouble is I’m running an illuminated rocker switch for the fog lights which will drain the battery. I have found a switched wire inside the car but I need to find one under the hood. any ideas?

 

Good morning. It would make sense that the fuses have constant 12volt on both sides of the switch as I’m looking for a source after the ignition switch. I even tried the fog light 7.5 fuse which is labeled on the fuse box to no avail. I’m trying to avoid having to run another wire through the firewall but Inthink I am going to have to do this. Any thoughts?