Recently my 3-button Transfer Case Selector Switch had been mysteriously cutting off (no lights). Removing the switch I found the connector that has the primary applied power feed seemed to be breaking contact. By touching it just right while it was still in place I could make the "2WD" light go on and off. The connector wasn't loose and all the contacts were clean. There was no apparent reason power should be lost.

I removed the switch and took the back off of it. Looking at the two pins on the switch for that connector where they just exited the switch (using a 10x loop) I could see what appeared to be cracks in the solder. I re-flowed the solder (adding about 0.5-1mm of fresh solder per pin) and it fixed the problem. Took me all of about 15 seconds of soldering.

I've attached a wiring diagram of the power feed only if anyone could use it. As you see in the diagram I have the switch disconnected where I made the repair.

 

Congrats on an easy and I'm sure very satisfying fix!

 

Great post, thanks for the continuing education.

 

Thanks for that, mine is sometimes like that too, but on my 4HI button.

 

This is only one fix of a couple different possibilities. Yours could be a problem with the TCCM or vacuum issue.

 

Thanks for sharing. This will hopefully help people troubleshoot similar issues.