There are two plugs, the one under the seat is for the red enduro device, the one on the left next to the headlight is for the sat nav, they do a plug from the dealer or nippy normans that fits.... if your sat nav has the resistor block in the power lead, the can bus only see,s the transformer. It will supply enough to turn on your sat nav but will not charge it, some times it also does not switch off with the key and can flatten the battery, these are my experience,s on my 1200 lc
To wire mine, I cut in to the harness just under the power socket it was the only to get my Garmin to work on the key...