I moved the battery to the trunk last week, and I must say I was suprisingly pleased by how easy it was. I almost suspect that ford considered putting it there in the first place!
Basically, I didnt hide it, it just sites on the right hand side, in the space between the wheel well, and the back of the trunk.
I ran the wire through the left hand side, under the trim, up to the dash, where there is a perfectly aligned hole through the fusebox mounting braket that lines up with a plug in the firewall that the wire can slip through easily.
A couple of tips:
Use the chassis for ground, dont run a wire to the underhood area. run the battery cable to the chassi, and then under the hood take the ground wire that is there now, and ground it to the chassis.
Take the plug out of the firewall, and cut a X in it with a box cutter or such, and leave the plug out.
Take a screw driver and run it through the hole left by the plug, and then you can see inside where to run the battery cable. After runnung the battery cable through the hole, slide the plug over the wire, and then place the plug pack in the firewall.
I tied down the battery with a battery box tie down, but you can just put it in a box and ties that down as well. I was too cheap to buy the box. The total cost of this was about $20, including the cable (the most expensive part).
Iraq-Land of the lost!
