Thank You for this help. I'll take the ignition switch back later. my son-n-law checked the wiring from the fuse to the transfer case (blow a fuse) checked the wire from the the fuse to the 4wd module (Blow a fuse) then checked the 4wd switch (blow a fuse) then checked wire, all seem to be OK. the other thing the blazer drive good other starting out I have to put it in 1st then overdrive and a lot of other things are happening e.g. clock stays on all the time, w.wipers come on when staring vic. and the keys did get stuck and would not lock back at park. I did finlly get it out and seams to work good now.
Any help whith this is much ap.