Welcome to the forum Duncan,
I'm trying to find a location or way to permanently wire my sat nav into my 2013 Focus Zetec 1.6 Tdi, initially I thought I could connect to the cigar lighter but this appears to be a permanent 12v feed, I need a feed that's linked to the ignition.
Can any one recommend alternative locations, I do not want to splice the existing wiring loom, I'm happy to make suitable connecting wires.
You could purchase a "piggy back fuse adaptor" which would plug in to the interior fuse board and share power from an ignition feed,
Giving you a dedicated positive feed to run to your sat Nav,
I recommend fitting a stand alone 12v socket to the other end,
This way if you upgrade sat Nav in future you can simply unplug charger, and fit the replacement,
All excess cable can be stored inside the dash out of sight.
When I say stand alone,
I mean one that has a surrounding cone shaped housing, designed to stand alone
The mk2.5 focus had an option with the stock 12v sockets,
As standard they stayed live for 1 hour after engine stopped,
But if you took the fuse out and put it in to the fuse socket next to it,
This resulted in the 12v sockets only being active when the ignition was live,
I'm not sure if the mk3 has this option but it was a good one.
Also for all automotive electrical supplys,
I highly recommend you see Dave at AutoStar electronics on eBay,
He will recommend you the correct amp cable to suit your application aswell as supply the "stand alone" 12v socket, and piggy back fuse adaptor,
Here's a link to his shop: http://stores.ebay.co.uk/autostarshop