I'm confused. You said to me that you wanted to go into the trunk and that you had previously run under the trim. Scotty says make a hole in the firewall and you say perfect. If that's perfect..then you could also consider what I suggested.
If thats the grommet in the pass floor board thats what I used easiest way ever plus it will seal itself when you pull the wire through. Just cut the hold too small
Sent from the Milky Way
2019 F150 XL - Make it run 12's N/A
2012 F150 STX - Gonna be a race truck
02 GT "Slowkar" 180k - Top Swap, Gen V, TOG Headers, 1.9s, e85, 3.25. It's literally the slowest e85 car ever....