4x4 problems... again

ok...heres the problem...originally my 4wd was not working at all....the lights would blink and it would not engage the front tires...I was having all kinds of problems...I found out one of my vacuum lines had a hole in it...i replaced the line and everything was working fine....until the other day...I turned my car on and none of the lights (2hi, 4hi, or 4lo) were lit...about 20 minutes after driving my 2hi light finally came on, but I was unable to change to 4wd...I would press the 4wd button, but the 2hi light stayed lit....no clue whats going on

Always give year and make and engine and mileage.
And what transfer case you have.
If no lights on a key on bulb check.
Look over wiring and fuses and power feeds first.
MT

Sorry, I got a little ahead of myself...Its a 95 blazer, 4.3, with 143,000 miles on it. I have no clue what transfer case I have, and I checked out the wires on the back of the 4wd switches and everything seems fine.

Sorry, I got a little ahead of myself...Its a 95 blazer, 4.3, with 143,000 miles on it. I have no clue what transfer case I have, and I checked out the wires on the back of the 4wd switches and everything seems fine.

There is a ID tag on the back of it.
But should be a 233.
On that one key on you can ground pin 13 on diagnostic connecter and get transfer case codes.
Check all wiring and plugin and fuses and if you can get a code post back code no.
Also Muddog has a how to on it that may help or search other post on here.
http://www.automotiveforums.com/vbulletin/showthread.php?t=572914