So here's the project. I want to hard wire a USB port into the area accessible through the back seat ashtray that is under the arm rest. The idea is that it will allow me to swap out my phone cradle in a few minutes when I switch phones while also allowing me to hide most of the cables without permanently modifying my interior by running them up under the plastic in the center console. If anyone has a wiring diagram they can share for lighter plugs in the arm rest it would be much appreciated. I'm also thinking about splicing into the 3.5mm audio jack as well.