remove the surrounding bezel and under dash panel remove the two big bolts that hold the steering column up let the column rest on the seat remove upper and lower screws that hold the gauge cluster in then pull er out and disconnect all the plugs in the back and the bulbs plug into the back of the cluster ya cant miss em it's easier than it sounds
If you have no dash lights at all on your 1989 S10 Blazer, a blown bulb can be the problem. You should also check the fuse.
The alternator is failing.
How to change dash lights on a 95 Ford Ranger?
Be sure the dash illumination dimmer switch is not turned off.
Just a suggestion, check your trailer lights harness for corrosion. They were taking the dash lights down in my chevy.
Fuses?
I have a 99 blazer with the same problem. If i move the light dimmer dial from side to side it will stop. You can change the switch or from time to time wiggle the switch.
There should be a roll switch right next to your light switch on your dash to dim the lights with.
Are you sure you didn't turn the dimmer down
might be a fuse
The dash light dimmer switch is turned off or bad or the fuse is blown
Check fuses, common circuit