Strange Electrical Plug?

I have only had this car for about two months now, and have had some lingering questions. The first of which is a solo electrical connector that I found on the driver's side of the vehicle by the radiator. The wire and connector appear to part of the same harness that the power for the fan motor comes from.

Photos:

 

On another note is a slight wine normal with the subaru's AWD system? I here the noise mostly when letting off of the gas at highway speeds. The noise sounds like letting off of the gas in a manual transmission car (but mine is an automatic). Gear oil has been changed recently.

https://plus.google.com/photos/109140080324792740447/albums/6065025719094483073?authkey=CJ6OhtqgrtOMxgE

 

http://https//plus.google.com/photos/109140080324792740447/albums/6065025719094483073?authkey=CJ6OhtqgrtOMxgE

Do you mean automatic fluid change? Front diff has separate gear oil with the auto trans (as well as rear diff). I'd make sure all three have been changed and have the correct fluid in them.

Yea, I did all of the work on the car my self. I changed front and rear differential fluid, transmission fluid and filter as well. A full fluid change was one of the first things that I did when I got the car. Any thoughts on the connector anyone?

I'm pretty sure I've seen the same connector on my car when I've removed the air box, I think it's for fog lights. My car doesn't have fog lights so I can't confirm this.

I was actually wondering the same exact thing myself. That was the only thing that I could think of. I just figured that if that were the case subaru would have put a plug over the connector end to protect it from weather an corrosion.