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If fuse is ok, could be a bad headlight switch
Check the fuses.
Check for a blown fuse in the fuse box under the dash.
check your interior or instrument panel lights fuse, they usually are all connected and when the fuse blows they all go.
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It may be wired wrong.
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.
Should be under the driver side dash.
the doors would have to be unlocked..there is a release lever under the dash
short in dash light circuit, but also check tailights. Sometimes no dash lights, AND NO TAILGHTS.
At Canadian Tire store in the automotive department.
Normally under the dash above drivers feet.