Originally Posted by An owned guy
I just cut a hole right through the black cap looking thing right in front of the battery on the drivers side. It comes out above the brake pedal. You have to cut the foam a little but, if you wiggle it right the wire will come out right over the carpet.
you should use a waterproof grommet (about $3) and they keep the water from going into the cabin. I had a hole rot out and I had to cut it out and patch it up with a stainless steel resin. My old forester, huh!