Hey sorry I missed this...I was away over the weekend and havent been on the forums since last week. Best way to contact is email.
Is this a 2011-2014 truck or a 2015+?
The "ENG" fuse in the underhood fuse block will work fine on 2011-2014. Unfortunately there arent many good/easy places to find switched ignition power on the interior of the 2007.5+ trucks...