I have a 1997 ford f150 4x4 ,heres the problem when i turn my headlight switch on both directional lights come on steady andv also the high beam light ,also the display on the radio goes out. When i turn the heat/ac on it does the same thing . please help Im about to lose it over this !!! I tried another headlight switch andit does the same thing.

 

have the truck checked at an electric shop before it gets worst , as far as i know it could be a cross wire or a bad connection and it may be really expensive..