i am having 4x4 problems with 05 super crew. when i bought the truck the four wheel drive worked because i tested it. Now it does seem to work and i cant figure out y. when i turn the **** for four wheel drive nothing happens the light on the dash dont come on and it does engage. i have already checked every fuse and relay associated with the 4x4 system and everything is good. So could i have a bad switch or is the electric shift motor on the truck bad? has anybody had this problem and does anybody know of a way to fix it? thanks

 

check your vacuum lines