Service 4wd light is on and no light on 4wd dash switch... 1998 4 door Tahoe...

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I tryed to switch from 2wd to 4wdlow and started blinking and went back to 2wd and blow a t case fuse I replaced the fuse and tryed again and some thing happen then the service 4wd light came on and light for dash switch isn't on and can't switch to nothing I have tryed taking the battery cables off for 30 minutes and take the fuse #8 and #2 and #24 and hook everything back up and the service 4wd light is still on I have power to dash switch for 4wd and t case and front end almost everything that haves to do with the 4wd wires I think its the dash switch but idk the dash switch comes on when I start the truck only for like 3 seconds and go's off... PLEASE HELP ME AND WALK ME THROW THIS THANKS...