I don't want to disconnect it...
As it comes from the factory, this connector is mounted to the inner top of the fender, and looks like it is just a dead end with a cap on it. When you remove the cap, the two terminals are joined by a resistor (probably for an alarm as BM donator suggests). I don't want to disconnect it, just detach it from the rear fender (where it is in the way) and swing the connector (with cap attached) out of the way, leaving free room for an expanded tool kit or whatever.
BTW, thanks for the replies everyone.