My 2001 blazer clicks quickly and repeatedly constantly when at idle and slightly above. It does sound like a relay and appears to be behind the instrument cluster. What should I be looking for?
This occurs only when running and stops when the engine speed is above an idle.

 

im having the same problem some times its super fast clicking and sometimes it sounds like the blinker is just stuck on every ware i drive lol its pretty anoying

 

I had this problem also. I replaced the turn signal relay, but that didn't work. I then replaced the multi switch (the one that controls the wipers/turn signals/ cruise control/ect) and that fixed the issue. While I was replacing it, I noticed the wire harness connection was damaged so that may have contributed to the problem. I also noted that the unit itself was rather worn and loose compared to the new one. It's worth checking out. YouTube has a great video on dismantling the steering column to replace it.

 

yep same problem with mine, constant clicking like a turn signal..
i tryed the fix for the hazzerd lights, but that did not work, so i found a replacment turn signal assy. at RockAuto.com for cheap and installed it..
clicking is gone,and i have bright new white letters on the turn signal
stalk again, like factory new

 

The clicking is no where near as slow as a turn signal or a hazard. It is much, much faster. Kinda like a couple of bb's being shaken in a small jar. Not very loud, but very rapid.
After flushing out the heater core yesterday, I went to start it up. Nothing but the heavy clicks of a weak battery or starter issue. So, I checked the battery terminals. One was loose. Tightened that & is started normally. Seems that the rapid clicking has decreased. Is there any way that it could be related to low battery voltage??