My car does have an alarm but it may be aftermarket .. Also my car has two horns one above the other just below the wire I am pointing out. Thank you Murkrow for your info , this gives me some thing to check out.. Will get back to you fellows when I figure this wire out..
Here is a better picture of the wire in question. I believe you are right Murkrow because this wire runs down to the lower horn . The plug must have been for the original alarm ... Thank you so much. Buy yourself a coffee and pretend is from me... lol