Two problems related to dash wiring have been reported for the 1999 Chevrolet Blazer. The most recently reported issues are listed below.
The multi function switch located on the driver's side under the dash is problematic. The failure of the switch results in the rapid clicking noise that can be heard from behind the glove box on the passenger side. This is such a common problem I can not believe there is not a recall. This is the second gm of this model that my family has owned with the same problem.
1999 Chevrolet s10 Blazer started vehicle, drove down driveway out on to street. Smelled smoke, returned home. Found back of drivers seat on fire, put out with garden hose. Wiring under drivers seat started on fire? we do not have heated or power seats on vehicle and we don't smoke. Damage was burned seat, carpet, rear floor mat, melted wiring. The vehicle does have the hazard/blinker that turns on intermittently for no apparent reason. Don't know if this is related.