Standard Ignition RY-225 Headlight Dimmer Switch Relay

Headlight Dimmer Switch Relay for OE-Style Electrical Repair

Standard Ignition RY-225 is a 12-volt headlight dimmer switch relay built for direct electrical service on a range of Mazda, Ford, Mercury, and Suzuki applications. It uses a 30 amp rating, a female square connector, and 4 male blade terminals to match the original relay-style layout used in many late-1980s through 1990s vehicles.

For drivers searching for a headlight dimmer switch relay for Mazda Protege, Ford Escort, or Mercury Tracer, RY-225 provides a service replacement built around OE-style connector and terminal specifications.

Key Features

• 12-volt relay for headlight dimmer switch circuit service
• 30 amp amperage rating for electrical switching applications
• Female square connector with 4 male blade terminals
• Composite housing helps protect internal components from underhood heat and harsh conditions
• Brass or copper contacts are used where specified for wear resistance
• Manufactured under TS16949 and ISO9001 certified quality systems

Detailed Product Information

Standard Ignition RY-225 is engineered as a relay replacement for vehicles that rely on a headlight dimmer switch relay in the lighting circuit. It is listed for applications including 1989-1999 Mazda Protege, 1991-1997 Ford Escort, 1991-1997 Mercury Tracer, 1989-1998 Mazda MPV, 1991-1998 Suzuki Sidekick, 1996-1998 Suzuki X-90, and related Mazda and Ford platforms. This part number, RY-225, is also referenced in the aftermarket under cross numbers such as Four Seasons 36148 and 83302.

Built with a composite housing and specified metal contacts, this relay is intended to maintain stable electrical switching in demanding vehicle environments. It is a practical choice when diagnosing lighting relay failure, intermittent dimmer operation, or relay-related headlight circuit issues on Mazda MX-3, Mazda RX-7, Ford Probe, and similar applications.

Common Issues This Relay Can Address

• Headlights that do not switch between high and low beam correctly
• Intermittent dimmer relay operation in the lighting circuit
• Noisy, sticking, or failed relay switching
• Electrical contact wear in an aging relay assembly
• Lighting faults traced to relay-side circuit interruption

Installation Notes and Tips

Verify connector shape, terminal count, and amperage rating before installation. Match the relay to the vehicle’s original electrical layout and inspect the surrounding fuse panel or relay location for heat damage, corrosion, or loose terminals. On listed applications such as Mazda 323, Mazda 626, Mazda MX-6, and Mercury Tracer, confirm the exact relay position and circuit configuration before replacement.

Fits 1989-1999 Mazda Protege, 1990-1994 Mazda Protege, 1989-1998 Mazda MPV, 1991-1998 Suzuki Sidekick, 1996-1998 Suzuki X-90, 1991-1997 Ford Escort, 1991-1997 Mercury Tracer, 1992-1996 Mazda MX-3, 1993-1995 Ford Probe, 1989 Ford Probe, 1989-1995 Mazda 323, 1993-1995 Mazda RX-7, 1989-1991 Mazda RX-7, 1990-1995 Suzuki Samurai, 1990-1994 Mazda 323, 1992-1994 Mazda 929, 1993 Mercury Tracer, 1990-1992 Mazda 626, 1990-1992 Mazda MX-6, 1989-1990 Ford Probe, 1989 Mazda B2200, and 1989 Mazda B2600.

Quality Assurance

Standard Ignition manufactures this relay under controlled quality processes with TS16949 and ISO9001 certified plants. The brand states that its production is managed from component selection through finished part assembly to help ensure the correct part for the intended vehicle application.