ok i have a 1998 f-150 4x4 auto 4.6l today i got in it to go to work, put the key in it dinged like usual, turned the key and everything went blank. After this happened i can hear a relay under the dash clicking bout every 10secs. I opened the hood unhooked the battery to reset ecm replaced cables and put key back in it dinged once then lost everything again even before i turned the key need some pointers where to look thanks