This thread is quite old I found it when I was looking for information.
Today I installed a 12 V socket for my nav.
I do not like the direct connection to the battery for the nav I prefer switched 12 V (there is a Ctek-socket directly connected under the seat for charging), and I hate drilling holes in the fairing. So I chose as location left of the ignition switch (have it similar on my TDM).
First step was making a mounting bracket for the small 12 V socket (I do not like the cigarette lighter type).
After testing with some cardboard templates the bracket was made of 2 mm aluminium. The Bracket is fixed on the left riser

Socket installed.

The Fazer has like the TDM switched 12 V on the horn (the horn switch closes to ground if activated). So I connected the socket to the horn.

