I have a 94 blazer, when you start it up the 4wd hi and low buttons light up for a second but if you try to get into 4hi it wont light up or engage, funny thing is I have 4lo that works. can anyone help with this issue. thanks

it's got to be a solanoid or relay for 4 hi. i'm not to sure where they are located.
good luck,
joe

yea sounds like a relay problem .... the relay im sure is in the dash, cause you can hear the click pretty clearly so .... try there