Title says it, I am trying to connect a wire to the battery to a air compressor in the trunk. I dont want it to look really weird and run from outside the car and instead i would rather run it from inside the car. How can i achieve this with a Mazda 3 2019? Thanks

 

Run it down under the car, along the brake or fuel lines to the rear & find a grommet at the rear to re-enter to trunk/boot.