i have a 98 civic LX..im trying to find where to run the power wire from my battery to the back where my amp is. my battery is on the passenger side, and i dont know how or where to run the wire from, like where is there an opening or where can i make an opening to run the wire? HELP?

 

Remove the battery, the remove the battery tray, you can fit up to a 4 ga wire through the main rubber grommet where you see all those wires entering the cabin. There should also be a few "blank" grommets that you could put a hole in and use there.

Then run the power wire behind the kickpanel, under the door sill, behind the rear arm rest section, then under the rear seat and into the trunk...