On the right hand side of the boot compartment on the Mk2.5 Focus and possibly the mk2 also,
their is an orange plug which is a positive feed for a 12v power socket,
the only additional items required to connect is a earth cable and a 12v socket,
attach a female spade connector to the earth feed and push it in to the slot next to the positive feed,
then push the orange connector on to the rear of the 12v power socket,
finally choose a location on the panel you would like to mount the socket and drill the hole.
their is power already being fed to the orange plug so their is no further wiring required.
I Purchased Ford 12v Power supply kit Finis Code: 1021887
it contained the 12v plug and cap
4metres of positive cable which i didnt need to use for fitting,
1 metre earth cable with female blade connector and ring terminal attached,
and 8 cable ties which i didnt need to use.
but this orange plug will work with any 12v socket that has 2 pins on the rear like this one found on ebay
I have crimped a ring terminal on to the opposite end of the earth feed cable,
and put it on to the screw that holds the panel in place like a washer then screwed the panel back in to place,
i now need to purchase a holesaw bit to fit the diameter of the 12v socket.
and the panels are back in place,
take care to ensure the rubber boot seal over laps the plastic interior around the boot opening, to avoid any leaks.