I have mine wired into that socket and find that the mount draws enough current, even with the sat nav out of the cradle, to stop the canbus shutting down every time. The clue is if you mount the sat nav without switching on the ignition and it fires up without using the nav unit on/off switch then the canbus has not shut down. It does not happen every time. Sometimes the canbus shuts down as you would expect it to. It may be an anomaly with my bike's canbus but I have wired a switch into the cable to isolate the cradle from the bike power when it is not needed.