I have 2003 F250 SD XLT 4x4 that has problems with check engine light comes on at start up and then the radio,windows,instrument cluster and wipers all do not work. After a few seconds/minutes you hear a relay make noise and everything comes on except for the wipers. I can usually smack on the dash just above the radio and wipers will begin to work. I have replaced instrument cluster,GEM module and had entire dash apart. Had a mechanic work on it for more than 3 weeks looking all with no luck in finding reason. Could this be a ground issue under the dash or possibly a problem in the radio itself since hitting dash above radio will most of time correct????