I tried to run my 0 gauge through the antenna grommet at first, LOL! That wasn't happening... plus then I had to deal with getting it under the console, and then back out from under it and under the rear seats...

Easier solution I found, run it right down to the right side frame rail, keeping clear of any moving suspension parts and exhaust, and putting on extra split loom if possible to protect the wire, zip tie it all tight to the frame so it doesn't move around. In my 4 door, I ended up coming up into the body through the floor just under the right rear seat. Drilled a hole just above the frame rail the size of a trunk floor plug that I found in a random car in a junk yard, cut a hole in it a little smaller than the 0 gauge wire, then ran it up through there. Perfect seal.











0 gauge is a bit large to hook to the amp I'm going to be running for now, so I had to step it down to 4 gauge. Just used an extra fuse holder I had sitting around. Eventually plan on using a distribution block because I also plan on wiring up a 110v inverter in the rear.

 

I ran mine through where the antenna is on the firewall. Was real easy.