I have an 08 F-150 HD Edition I bought 5 months ago. It had 18,000 miles when I bought it & has 25,000 now. The problem I am having is ocassionally the tach & speedo will quite working and all the warning lights will come on, also the AC quites when this happens. At times everything will return to normal in a few minutes & sometimes it is a few hours. It has been to Ford 3 times & they can't find the problem. I have searched the forum & seen this brought up a few times but I have never seen a solution. Battery is in good shape & it doesn't seem to make any difference if I'm driving on smooth roads, rough roads, or sitting still at an idle when it happens. Any help would be greatly appreciated.