I have a 94 grand chreeoke all wheel drive and my mechanic said he replaced this switch in the driver side by the tire. The alarm goes off all the time and now makes a humming sound in the rear help.

Your post was moved the the "Grand" Cherokee section from the Cherokee section. Take it back to him and find out more about he did.

I got the exact same indicator on my 94 GC. I dunno where it is or how to fix it. But I know my fulltime 4wd np249 doesnt work.