Standard Ignition RY-435 Headlight Dimmer Switch Relay

Headlight Dimmer Switch Relay for Ford and Mercury

Standard Ignition RY-435 is a 12-volt headlight dimmer switch relay built for vehicles that need reliable electrical switching in demanding underhood conditions. It uses a 4-terminal blade design with a rectangular connector shape and a 20 amp amperage rating for consistent relay operation.

Key Features

• 12-volt headlight dimmer switch relay
• 20 amp amperage rating
• Rectangular connector shape
• 4 male blade terminals
• Composite housing for heat and underhood exposure resistance
• Brass or copper contacts where specified for wear resistance

Detailed Description

This Standard Ignition RY-435 relay is manufactured to support headlight dimmer switch operation with the electrical characteristics needed for direct replacement service. It is built with composite housing materials to help withstand harsh temperatures and severe underhood conditions, while specified brass or copper contacts support long-term electrical wear resistance. Standard Ignition manufactures this part under TS16949 and ISO9001 certified processes for controlled production quality. This part cross-references Davico Mfg 19358 for the same application. Compatible With 1995-2000 Ford Contour, 1995-2000 Mercury Mystique, 1999-2002 Mercury Cougar, and 1997 Mercury Grand Marquis applications where this relay configuration is specified.

What It Helps Address

• Intermittent headlight dimmer relay operation
• Loss of switching control in the lighting circuit
• Electrical contact wear from repeated use
• Heat-related relay housing deterioration
• Connector mismatch during relay replacement

Installation Notes and Tips

Verify the connector shape, terminal count, terminal gender, and voltage rating before installation. Confirm the vehicle’s relay location and wiring layout against the original part to ensure the correct headlight dimmer switch relay is selected. For fitment-based searches, this part fits 1995-2000 Ford Contour, 1995-2000 Mercury Mystique, 1999-2002 Mercury Cougar, and 1997 Mercury Grand Marquis.

Quality Assurance

Standard Ignition produces this relay under controlled manufacturing standards with TS16949 and ISO9001 certified plants. The brand states that quality control is maintained from component selection through finished product, helping ensure the part matches the intended vehicle application.