It depends on what year it is. Need more info.
Yes. There are fuses for everything electrical on that vehicle.
Left side bottom of Dash Board, with a Plastic Cover
Check the fuses
Did you check your fuses???
Head light fuse is 20 amp
Check the brake light switch.
have you checked the fuel gauge itself to make sure it is working
The 1993 Chevrolet Blazer headlight fuses can be found in the fuse box. The exact location of the fuses will be listed on the inside cover of the fuse box.
One box located by driver side door and another front engine compartment on the driver side.
Check the main fuses in the fuse center under the hood.
How do you change the flasher on a Chevy S-10?
If the fuses check good it is probably low on freon. If that is the case you have a leak somewhere. Take it to a shop that does a/c work.