Ah! So this may be part of the touring + " unique user experience".
One more suggestion, try it without the internal battery being fully charged.
And boot everything up in this order: 1 connect the garmin and gomadic. 2 make sure both units are off.
3 turn on the gomadic. 4 wait for the gomadic to boot up the garmin.
I think this allows the power to be drawn from the gomadic first.
At least it works for me.
But..." Unique user experience ".
Hope. This helps.