On my way home tonight in my 96 Tahoe I looked down at the dash and my 2wd light was not lit as a matter of fact none of the lights on my 4wd switches were lit. I pressed the 2wd button and got nothing I then pressed the 4wd button and still got nothing not even a relay click. I then stopped and put the truck in neutral and pressed the 4Hi button and both the 4Hi and Lo lights blinked simultaneously about 4 or 5 times and then went out. I then pressed the 2wd and the light came on. While at a stop sign I then pressed the 4hi button and everything went out again. When I got home I put it in neutral again and pressed 4hi and got nothing. I then pressed 4lo and it engaged. But I still can't get anything out of 4hi. Please HELP!!