Send power to your brake lamps the instant the pedal is pressed with the Standard Ignition Brake Light Switch SLS-122 — a direct-fit replacement for the 1978-1980 Ford Fiesta and the 1971-1977 Mercury Capri.
- Pedal-actuated switching: completes the electrical circuit to the brake lights when the brake pedal is depressed and opens it when the pedal returns.
- Direct-fit design: intended to install in place of the original switch on the listed applications.
- Signs it may need replacing: brake lights that stay dark when you brake, lights that stay on with the pedal released, or intermittent operation — if a failed switch is the cause, this replaces it.
The brake light switch is a small but critical safety component: when it fails, the brake lamps may not illuminate as you slow down. Because wiring, fuses, or bulbs can produce similar symptoms, diagnose the cause before replacing.
Interchange: S719 · F4826 · SL301 · D2RY13480A · E0RZ13480A · 88924601. Manufacturer part number SLS-122 (also SLS122).
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does the Standard Ignition SLS-122 brake light switch do?
It's a pedal-actuated switch that completes the circuit to your brake lamps when you press the brake pedal and opens it when you release, so the brake lights signal your stops.
What vehicles does the SLS-122 fit?
It's a direct-fit replacement for the 1978-1980 Ford Fiesta and the 1971-1977 Mercury Capri. Check the Buyer's Guide tab to confirm it matches your vehicle.
What are the signs of a failed brake light switch?
Brake lights that don't come on when you press the pedal, lights that stay on after you release it, or intermittent operation. Confirm the cause, as wiring or bulbs can act similarly.
Which part numbers does the SLS-122 replace?
It interchanges with S719, F4826, SL301, D2RY13480A, E0RZ13480A and 88924601.
Will replacing the switch fix my brake lights?
If a failed brake light switch is the cause, this replaces it. Since fuses, wiring, and bulbs can cause the same symptoms, diagnose the issue before installing.
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