I have no 4x4, The black box behind the drivers seat has no red light even when pressing the botton on it. I pulled the transfer shift motor bench tested it, it was good. Did the same with the dash botton it is good. Is it possiable that the black box is shot? Or is there a fuse in line that is blowen

 

Check your fuses but it could very well be the control module. Mine has gone out once