I just bought a 2000 Chevy Blazer. The left blinker dash indicator sometimes wont light up. Even though it doesn't show on the dash, the blinker still works and you can hear the relay clicking normal under the glove box. The problem is intermittent though, sometimes the light on the dash works and sometimes it doesn't. Could anybody give me a lead on where to look first? thanks!

 

Sounds like you have a dash bulb burnt out or has the filament bouncing around.
The signals work but you don't get confirmation that they are = inside dash issue IMO.
Might be a wiring issue from the signal relay to the dash (behind the glove box) check & make sure it's secure.

Is it the same for left & right?... If yes I'd spend the $20 & replace the signal relay.