It could be a junk switch or it could be bad contacts inside the transfer case motor.. Does the transfer case switch to the selected gears? Everytime? If so, you might try another switch. If it does the same, I would say the motor contacts are bad. Replace the motor if you want the lights, But I personally wouldn't do it until the motor quit switching gears. They're not cheap.
SOURCE: 1994 chevy s10 blazer 4x4 push button type
small sylinoid on the top of the transfer case needs replaced. easy to do. it has three vacumelines going to it just trun out and replace like a bolt.
SOURCE: 1998 Chevy Blazer 4x4, $ wheel drive won't work (both 4hi & 4lo )
Reset the computer by disconnecting the battery. This should solve this. nutetral is for the four lo only to engage.
Mike
SOURCE: Chevy pickup 4-wheel drive won't engage
Replace the push button selector assembly. Common failures. If that isnt the problem then the encoder motor on transfer case has failed. Try switch first.
SOURCE: I have a 2003 chevy blazer LS, 2-door 4wd w/
try putting in nuetral and then shift into high gear . if still does not work sounds like the 4x4 acctuator is bad
SOURCE: My 1999 chevy silverado 1500 four wheel drive
You probably have a bad encoder motor.It is located on the side of the transfer case on the drivers side.It is black.The other problem they had with these was the switch but you have already replaced this so your next thing is the encoder motor.Hope this helps.Good luck.
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