There is no headlight relay. All the switching is done in the headlight switch including a circuit breaker.
We are going to need to know what engine you have in that 92 S10.
I think it is under the hood, drivers side, up front close to the radiator. It is mounted to the drivers side fender behind headlight
On the '92 sunblrd SE the power for the lights to from fuse to headlight switch to dimmer switch to bulb, no relay involved.
Could be the switch and pigtail at fault or the high speed relay.
In the convenience center under the drivers side of the dash.
It is attached to the throttle body.
4l60e i got a 92 chevy blazer with the w engine it came with a 700 R
Inside the distributor.
The oil pump on a 92 Chevy S10 is changed by draining the oil, unbolting the oil pan, and lower it from the vehicle. The pump can then be unbolted and a new one put in place.
Next to the distributor
There are many fuses and relays in that vehicle, we need to know which one you are looking for.
look on the right front inside firewall i think its there