4wd light stays on
 

I have recently joined here, and glad to see all the support you guys give.
I bought a 95 blazer a couple of months ago, and now i'm at fixing the 4wd. I fixed the problem i had with no 4wd. but the problem of the 4wd light remaining on is still there. I can't go to 4wd, but i can change from 4wd lo to 2wd hi. either gear its put in, the 4wd hi light remains on, and the other lights only blink when i push them, but she DO engage to what i push, except 4wd hi. Any ideas guys. Thanks