All at once my ac/heater blower.power windows,power mirrors stopped working,but, the best part is when i open the door the overhead light flashes on an off like the hazards an when i put the dash dimmer on the turn signals stop working an theres a buzzing coming from the #1 relay??? 1998 f-150 4.6 Anyone heard of this??? Any help would be much appreciated

 

First thing I would do is get the battery checked.