Standard Ignition RY-306 Headlight Dimmer Switch Relay

Headlight Dimmer Switch Relay for OE-Style Electrical Control

Standard Ignition RY-306 is a 12-volt headlight dimmer switch relay built for reliable electrical switching in the lighting circuit. It uses a square connector shape, 5 male blade terminals, and a 20 amp amperage rating to support proper relay function in the vehicle’s lighting system.

Compatible With 1995-2003 Ford Focus, Mercury Cougar, Ford Contour, Mercury Mystique, and 2001 Dodge Ram 1500/2500/3500 applications listed below, this relay is a direct-fit service part for vehicles that use the specified connector and terminal configuration. Standard Ignition RY-306 is also cross-referenced to Gates 19425 for the same application.

Key Features

• Headlight dimmer switch relay for lighting circuit control
• 12-volt electrical rating with 20 amp capacity
• Square connector shape with 5 male blade terminals
• Composite housing for resistance to harsh underhood temperatures
• Brass or copper contacts where specified for wear resistance
• Manufactured under TS16949 and ISO9001 certified processes

Detailed Description

This Standard Ignition relay is engineered as an OE-style replacement for vehicles that require a headlight dimmer switch relay with the listed terminal layout and electrical specifications. The composite housing helps protect the relay from heat and demanding underhood conditions, while the contact design supports consistent switching performance over time. Standard Ignition RY-306 is built under controlled manufacturing standards to help ensure the correct part is supplied for the correct vehicle application.

Use this relay when servicing lighting control concerns on 2000-2003 Ford Focus, 1999-2002 Mercury Cougar, 1995-2000 Ford Contour, 1995-2000 Mercury Mystique, and 2001 Dodge Ram 1500, Ram 1500 Van, Ram 2500, Ram 2500 Van, Ram 3500, and Ram 3500 Van applications listed in the fitment data. The part number RY-306 is a useful reference when verifying replacement needs against the original relay.

What It Helps Address

• Headlight dimmer relay failure causing inconsistent beam switching
• Noisy or intermittent lighting relay operation
• Electrical contact wear in the headlight control circuit
• Heat-related relay housing deterioration
• Replacement needs for vehicles using the specified 5-terminal blade layout

Installation Notes and Tips

Verify connector shape, terminal count, terminal type, and voltage before installation. Confirm vehicle-specific fitment for the exact year, make, and model, especially on 2000-2003 Ford Focus applications where alternator compatibility is noted in the fitment data. Compare the original relay to Standard Ignition RY-306 to confirm the square connector and male blade terminal arrangement before replacement.

Quality Assurance

Standard Ignition manufactures this relay under stringent quality requirements with TS16949 and ISO9001 certified plants. The brand’s OE-focused manufacturing process supports consistent part control from component selection through finished product inspection.