Fuse box modification to house add a fuse?

So if the switch is not selected then no power is consumed, correct?

 

I'm assuming, that only makes sense to me but I'm not super knowledgeable on this stuff. I just switched the add a fuse to the horn and hazard lights an it works just the same. I faced the fuse in the right position this time.

 

Well, in the location you now have selected the install of the add-a-fuse is facing "improperly". Depending on which circuit you choose is the location of the feed busbar. What fuse size does the mod require to work? (not the circuit you're tapping)

 

That, I don't know. I'm not sure what amps the Trac ECU is. I've tried to find this out but I couldn't find info. Here's photo of how I have it now.