Hi Keefey56,
I have a Tom Tom running off the USB and it works and charges fine. I ran a cable over the back side of the arm rest, which is hidden by the seat. This cable goes all the way around under the hard plastic of the centre unit and up to under the steering wheel. I also ran another cable to the boot for a cool box that I occasionally use. Additionally I have headrest DVD players running off the cig lighter socket.
Hope this helps
Mark
Sent from my iPhone using Lexus OC