Need to know what year the Blazer is.
Have you checked that the headlight switch is working properly?
No, it does not.
It is built into the headlight switch.
There is no "kill switch" on that Chevy Blazer.
Inside the headlight switch.
You didn't mention what year but the headlight switch in any S10 I've ever seen has always been on the far left side of the dash.
The headlight circuit breaker is intergrated with the headlight switch.
None
change the headlight switch it controls the running lights....$15 at autozone
You do not ,you replace it .
It on the driver side right behing the headlight in the fender wall
Back then the headlight circuit was protected by a circuit breaker that was built into the headlight switch.