Standard Ignition SLS-91 Brake Light Switch

Brake Light Switch for Ford and Lincoln Applications

The Standard Ignition SLS-91 brake light switch is built for dependable stoplamp signal control in classic Ford and Lincoln vehicles. It uses a male connector with two blade terminals and is engineered for consistent electrical switching performance in daily service.

Compatible with 1975-1979 Ford Thunderbird, 1975-1979 Lincoln Continental, 1976-1978 Ford LTD, 1975-1978 Mercury Grand Marquis, and 1975-1977 Mercury Marquis, this SLS-91 brake light switch supports proper brake lamp operation across a wide range of vintage applications.

Key Features

• Brake light switch for stoplamp circuit operation
• Male connector with 1 connector and 2 male blade terminals
• Brass or high-impact composite housing design, depending on application
• Spring and contact arrangement helps reduce arcing for longer service life
• Copper alloy conductors for strong electrical conductivity and low resistance
• 100% tested for mechanical and electrical switching performance

Detailed Description

Standard Ignition SLS-91 is a direct-fit style brake light switch designed for service professionals working on classic Ford, Lincoln, and Mercury vehicles. The switch is built with durable materials and a contact design intended to maintain stable stoplight function while supporting reliable current flow through the brake lamp circuit. This part cross-references Four Seasons 58100 for the same application.

Use the SLS-91 when servicing brake pedal switch circuits on vehicles such as the Ford Thunderbird, Lincoln Continental, and Mercury Marquis. The part number SLS-91 is also a useful reference when sourcing a replacement brake light switch for older Ford LTD and Grand Marquis models.

What It Helps Fix

• Brake lights that do not illuminate when the pedal is pressed
• Intermittent stoplamp operation
• Electrical switching issues in the brake pedal circuit
• Excessive contact wear from arcing
• Poor conductivity caused by aging switch components

Installation Notes and Tips

Verify connector style, terminal type, and vehicle application before installation. Confirm the brake pedal switch mounting and electrical connection match the original configuration on your Ford Thunderbird, Lincoln Continental, or other listed vehicle. Inspect the harness terminals for corrosion or looseness before connecting the new switch.

Quality Assurance

Standard Ignition manufactures this brake light switch with complete quality control from component selection through final production. Each SLS-91 switch is tested for both mechanical action and electrical performance to support consistent operation in service.