Roots 12003XM H4 Heavy Duty Relay Wiring Harness Kit | 60A (30+30) Relay | High-Power Headlamp Application | Automotive

H4 headlamp wiring harness with 60A (30+30) relay, designed for high-power headlamp applications in cars and automotive vehicles

The Roots 12003XM is an H4 headlamp wiring harness with an integrated relay, designed to provide a dedicated electrical path for H4 headlamp applications. It uses a relay-based wiring setup that routes power for the headlamps directly from the battery through the relay rather than relying entirely on the vehicle's original headlamp switching circuit, which is intended to better manage the electrical load associated with high-power headlamp setups.

H4 Headlamp Wiring Harness

The Roots 12003XM is designed specifically for H4 headlamp applications. The H4 is a dual-filament bulb type used in a wide range of cars and automotive vehicles for both high beam and low beam functions. Confirm that your vehicle uses an H4 headlamp socket before purchasing this kit.

60A (30+30) Heavy-Duty Relay Configuration

The kit includes a 60A relay in a 30+30 configuration, meaning it handles 30A per headlamp channel. This heavy-duty relay rating is suited to the electrical load associated with high-power headlamp setups, where the factory headlamp switching circuit may not be designed to carry the additional current draw of upgraded or high-wattage headlamp bulbs.

Dedicated Wiring Path for Headlamps

A relay wiring harness provides a separate, dedicated circuit for the headlamps. Rather than drawing the full headlamp current through the vehicle's original headlamp switch and wiring, the relay takes a small trigger signal from the original circuit and uses it to switch a heavier dedicated circuit fed directly from the battery. This arrangement is commonly used when fitting high-power headlamp bulbs into vehicles with standard factory headlamp wiring.

Complete Wiring Harness Kit

The Roots 12003XM is supplied as a complete headlamp wiring harness kit including the relay and associated wiring connections, making it a self-contained solution rather than just a standalone relay. The kit contains the components required to set up the relay wiring arrangement for H4 headlamp applications.

Automotive Application

The Roots headlamp wiring harness range is designed for cars and automotive headlamp applications. The 12003XM is the H4 configuration in the range. Roots also produces headlamp wiring harnesses for H1 and H7 applications, with relay configurations available in both 60A and 80A ratings depending on the model.

Fitment and Compatibility Note

This wiring kit is designed for vehicles that use an H4 headlamp socket. Before purchasing, verify that your vehicle's headlamp uses an H4 connector. The harness, relay, and wiring configuration should be checked before fitting to ensure they are appropriate for the vehicle's electrical system. Professional installation by an experienced auto electrician is recommended.

What is in the Box

One Roots H4 Head Lamp Wiring Harness including the relay and wiring connections as supplied.