I just completed the setup of the 2012 focus, so I thought I'd add a few tips even though this thread is old. Someone may find this useful.
First, there are additional negative terminal wires hitched to the battery, so disconnecting the main wire on the body bolt doesn't do it. I added a disconnect switch to the negative side, see picture 1.
The battery must be disconnected to ensure the electronic transmission does not shift out of neutral (I was told this).
2. Very nifty way to handle the lights is to use the kit that adds a socket and bulb to the rear lenses and run the wire to the front. No splicing or diodes, no problems with existing light circuits. Very easy to do. Drill through the back of the plastic lense box to add the bulb.
3. There is a hole through the firewall where the clutch pedal would pass through (mine is automatic). This is handy for passing wires through to the cabin for brake buddy and an added power socket to run the brake buddy when the battery is disconnected.
4. Blue Ox instructions for base plate leave out a few steps.
a. Loosen the two bolts on each side where the plastic front surround meets the fenders, to slide the front surround out. Tough to get to these bolts.
b. Take the headlights out before you remove the front surround
c. Disconnect the drivers fog light before you remove the surround
d. Buy some extra plastic pin rivets from Ford, you'll need them
e. Be careful when remounting the horn where blue-ox directions indicate. You don't want it rubbing on the coolant line that is adjacent to it. Bend the horn mount out to clear the coolant line.
f. Whack off the top of the stems that are the electrical connector mounts where they protrude above the tow bracket cross beam. They will be in your way when you try to get the rubber air dam boot remounted.
For what it's worth, I mounted the break-away switch with no metal to metal contact to the car, so that can use the on-board battery to power the brake buddy with no worry about ground jumping through the break-away wiring. Don't know if this is an issue, but not difficult so why not.
For those interested, the blue ox bracket comes out at 14.5 inches above ground on the focus. With my Phaeton at 17 inches, I think that's close enough (within 3 inches), so no drop hitch for me.
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