MRC Racing Components K Series Chassis Adapter Race Relay Fuse Box Lead Harness K20 K24

The MRC Racing Components Race Adapter Harness is the perfect solution for race cars running engine-only wiring setups. Designed to simplify K-swap installations, this harness allows you to quickly run an MRC K-Swap Engine Harness or OEM 02–04 RSX / EP3 engine harness in virtually any chassis.

Built specifically for racing applications, this adapter harness includes five integrated relays and fused circuits to power all critical engine functions. It eliminates the complexity of building your own relay panel and wiring system, making installation fast, clean, and reliable.

The harness features plug-and-play connections where it matters most, along with flying lead wires for components such as the cooling fan, fuel pump, and optional gauge cluster functions. Simply route the labeled wires to their designated points according to the installation instructions, connect power and ignition, and you’re ready to fire the engine.

Features

• Designed for engine-only race car wiring setups
• Compatible with MRC K-Swap Engine Harnesses
• Works with OEM 02–04 RSX / EP3 engine harnesses
• Integrated relay and fuse panel for critical circuits
• Quick and simple installation

Included Components

• Relays for ECU, Fan, Fuel Pump, Starter, and O2 Sensor
• Pre-wired ECU “E” plug
• C101 plug-and-play connector to engine harness
• Primary 4-wire O2 sensor connector
• Fan and Fuel Pump flying lead wires
• Ignition switch and gauge cluster hookup leads

This harness is ideal for drag cars, track builds, and stripped race vehicles where a simple, reliable engine management wiring solution is needed.

Built with the same performance-driven design and reliability that defines every MRC Racing Components product.

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Order Processing Time:

Orders are usually processed within 24-48 hours after the order has been placed.
Custom or special order items may take longer to process, typically 3-5 business days.

Shipping Methods:

Standard Shipping (3-7 business days)
Expedited Shipping (2-3 business days)
Express Shipping (1-2 business days)

Packaging:

Rest assured that all items will be securely and safely packaged to prevent any damage during transit. Fragile or high-value parts will be packaged with additional protective materials, such as bubble wrap or foam padding.

Shipping Rates:

Shipping rates vary based on the size, weight, and destination of the package. You can view the estimated shipping costs for your order during the checkout process before placing your order.

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International Shipping:

We ship worldwide! Please note that international shipping rates and delivery times may vary based on destination. Customers are responsible for any customs fees, import taxes, or additional charges that may apply.