Standard Ignition SLS-121 Brake Light Switch

Brake Light Switch for Cruise Control Applications

Standard Ignition SLS-121 is a 12-volt brake light switch built with a plastic and metal construction, a rectangular single connector, and blade terminals for direct electrical connection. It is a screw-in style switch with a mounting bracket, hex nut, and male connector and terminal design for service replacement on select Mazda and Ford vehicles with cruise control.

Key Features

• Brake light switch for 12-volt electrical systems
• 4 terminal, blade-style design with 1 rectangular male connector
• Screw-in attachment method with mounting bracket(s) included
• Plastic and metal construction with plastic finish
• Hex nut included for installation
• Standard Ignition SLS-121 replacement part

Detailed Description

Standard Ignition SLS-121 is a brake light switch engineered for vehicles equipped with cruise control, where accurate brake pedal signal input is required for stop lamp operation and related control functions. This part number is listed for applications including the Mazda MPV, Mazda 323, Mazda 626, Mazda 929, Mazda B2000, Mazda B2200, Mazda B2600, Mazda MX-6, Mazda RX-7, and the 1989 Ford Probe. If you are searching for a brake light switch for a 1983-1989 Mazda 626 with cruise control or a 1984-1988 Mazda RX-7 with cruise control, SLS-121 is the direct reference to review.

This part cross-references Ford E8GY13480A and Standard Ignition SL335 for the same application.

What It Helps Resolve

• Brake lamps that do not illuminate when the pedal is pressed
• Intermittent stop lamp operation
• Cruise control disengagement issues tied to brake pedal input
• Electrical signal loss at the brake switch connector
• Replacement needs for worn or damaged brake switch assemblies

Installation Notes and Tips

Verify connector shape, terminal count, and mounting style before installation. This brake light switch uses a screw-in attachment method and a rectangular male connector, so the replacement should match the original electrical and mechanical layout. Confirm vehicle application by year, make, model, and cruise control configuration before ordering. Standard Ignition SLS-121 is listed for 12-volt systems and does not include a wiring harness.

Quality Assurance

Standard Ignition supplies electrical replacement parts for service applications, and this brake light switch is built with the specified connector, terminal, and mounting features needed for listed fitments. Use the part number SLS-121 to confirm the correct replacement against the original switch and vehicle application data.