Keep your brake lights firing on cue with the Standard Ignition Brake Light Switch SLS-273, a stoplight switch that completes the 12-volt circuit powering the brake lamps when the brakes are applied. It's a direct-fit replacement for a wide range of classic British and European cars, including the 1957-1958 Aston Martin DB, 1955-1956 Jaguar XK140, 1956-1962 MG MGA, 1961-1968 Triumph Herald, and 1959-1963 Vauxhall Victor — see the Buyer's Guide tab for the full list of 23 applications.
- Copper alloy conductors: deliver strong electrical conductivity with low resistive losses.
- Reduced arcing: a special-design spring and contact arrangement helps extend service life.
- 100% tested: each switch is verified for both mechanical and electrical switching performance.
- Screw-in fit: metal housing with a single round male connector carrying two male bullet terminals.
Wiring harness and mounting hardware are not included, so transfer your original connections or source them separately as directed by the service procedure. Intermittent brake lights, lamps that won't light, or lamps that stay on are signs this switch may need replacing — diagnose the cause before installing. Country of origin: Mexico.
Interchange: S550 · SL144 · 31440 · 34765
Manufacturer part number SLS-273
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does the SLS-273 do?
It's a stoplight switch that completes the 12-volt electrical circuit powering the brake lamps when the brakes are applied.
Which vehicles does it fit?
It fits 23 classic applications, including the 1957-1958 Aston Martin DB, 1955-1956 Jaguar XK140, 1956-1962 MG MGA, and 1961-1968 Triumph Herald. See the Buyer's Guide tab for the full list.
How does it install?
It uses a screw-in attachment with a single round male connector and two male bullet terminals. Wiring harness and mounting hardware are not included.
What are signs this switch may need replacing?
Brake lights that won't illuminate, stay on, or work intermittently can indicate a failed switch. Diagnose the cause before replacing, as other components can produce the same symptoms.
What numbers does this switch interchange with?
It cross-references S550, SL144, 31440, and 34765. The manufacturer part number is SLS-273.
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