Is there a relay for the high brake light on 1994 Chevy S-10 and if so where is it located?

The 1994 Chevy S-10 high-mounted brake light (CHMSL) doesn't typically use a dedicated relay. The brake light circuit is usually controlled directly by the brake light switch and fuses. The CHMSL is wired into that circuit, meaning any problems are more likely related to the switch, wiring, fuses, or the bulb itself.

Therefore, you won't find a separate relay specifically for the high brake light. Check the following instead:

* Fuses: Consult your owner's manual to locate the fuse for the brake lights. A blown fuse is the most common cause of brake light failure.

* Brake Light Switch: This switch is typically located near the brake pedal. It's a relatively inexpensive part and a common source of failure. A faulty switch may not be completing the circuit.

* Wiring: Inspect the wiring harness leading to the CHMSL, looking for any breaks, corrosion, or loose connections. Pay close attention to the connectors at both ends.

* CHMSL Bulb: Make sure the bulb itself isn't burnt out.

If you've checked all of these and the high brake light still isn't working, you might need a qualified mechanic to diagnose a more complex electrical problem. However, it's highly unlikely a dedicated relay is the culprit.