I have the same wires and connector on a 2008 model, but mine are connected.
The wire coming from down below /aft is active when the nav
instruments are switched on at the switch panel.
The switch in the panel just activates a 25A relay under the
bed in the port aft
cabin which feeds the
autopilot.
I can only speculate as I don't have any tool here to trace the wires:
My take is that this wire runs back to the nav area so that larger consumers (chartplotters,
radar processors, etc) can be connected to the same relay.
If you want to know for sure: these RF tools described by A64Pilot
work quite well and cost only around 10 bucks on ebay (shipping on the slow boat from
china of course).
If you want to
lift out for
winter: Sant Carles boatyard is filling up quickly, our 380 is already on the dry!