I've got 2 - a switched supply to a triple output screwed to the outside of the glovebox with the sockets pointing downwards. This is fused at 10A and is used for dash cam and satnav.
The other is mounted on top of the transmission tunnel at the rear, up against the rear bulkhead. It is directly connected to the battery so it is always live, and is fused at 15A. I have used it for powering the laptop when data logging from the OBD port.
Last edited by Hamwich; 15/04/15 10:46 AM.