Keep your brake lights signaling on cue with the Standard Ignition Brake Light Switch SLS-121 ("Stoplight Switch"). It drops in as a direct-fit replacement for the listed applications, including the 1989 Ford Probe [All], 1986-1989 Mazda 323 [All], 1983-1989 Mazda 626 [All], 1988-1989 Mazda 929 [All], and 1984-1988 Mazda RX-7 [All] — see the Buyer's Guide tab for the full list. A brake light switch senses brake-pedal movement and completes the circuit that powers the stop lamps; if a failed switch is the cause of brake lights that stay dark or stay lit, this replaces it.
- Copper alloy conductors: deliver strong electrical conductivity with low resistive losses.
- Special-design spring and contact arrangement: helps reduce arcing for extended service life.
- 100% tested: each switch is verified for both mechanical and electrical switching performance.
- Built for service: plastic and metal construction, rectangular connector, four male blade terminals, 12-volt, screw-in attachment.
Includes a hex nut and mounting bracket(s); a wiring harness is not included. Country of origin: Japan.
Interchange: S6020 · JA435 · SL335 · E8GY13480A · E8GY13480C · SWE2074A · 88924621 · B00366490 · H00366490 · H00366490A · Manufacturer part number SLS-121.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does this brake light switch do?
It senses brake-pedal movement and completes the circuit that powers your stop lamps. When you press the pedal, the switch signals the brake lights to illuminate.
Which vehicles does the SLS-121 fit?
It's a direct-fit replacement for the listed applications, including the 1989 Ford Probe and various Mazda models such as the 323, 626, 929, MX-6, and RX-7. Check the Buyer's Guide tab for the full list.
What's included in the box?
The switch ships with a hex nut and mounting bracket(s). A wiring harness is not included.
How does it mount and connect?
It uses a screw-in attachment method and has a single rectangular male connector with four male blade terminals, rated for 12 volts.
What are signs this switch may need replacing?
Brake lights that don't come on when you press the pedal, or that stay lit, can signal a failed switch. Diagnose the cause first, since these symptoms can have other sources.
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