Installing an AC - what is this plug?

[Erick]

Found this triangle plug behind the false wall in the mid berth, anyone know what it is for? Maybe pre wired for AC? I do have the AC toggle switch. 2003 240DA

 

[kvduff]

that black/yellow or brown yellow wire has a numbered tag on it. Read the number and then use the wiring schematic to trace that wire.

 

[ttmott]

That looks to be a generator remote start/monitor connector. The Blk/Yel wire also corresponds to the generator wiring (instrument negative return)....
If your boat doesn't have a generator then probably the pre-wiring.