2000 Ford Focus SE 4 Gauge Power

Don't go outside of the car.  Keep it thru the firewall.  Disconnect battery neg. terminal while you're probing at the firewall.  Use something like a coat hanger, wrap the end well with electrical tape so it doesn't cut into anything.  You may want to raise the front end up on jackstands and look at the firewall from the bottom engine side to get an idea of where to go through.  If you find any bare places, locate the area from the passenger side and pull carpet/pad out of the way to drill.  First hole needs only be big enough for the probe.  If you see the hanger emerge on the other side, redrill to specific grommet size, wrap power wire onto probe, and push through.  Place grommet over the wire and leave it loose, then secure into hole after complete install of wire.Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

drivers side, about 10 inches above brake pedal. isn't there a spot there?? I thought there was.. if not then do what stevdart said.

Its it a manual or auto. transmission?? if its auto you should be able to drill through the firewall where the clutch normally goes.