Spal Fan Wiring Harness with Relay

The Spal Fan Wiring Harness with Relay by DeWitts Radiator is a complete electrical assembly designed for seamless integration of aftermarket cooling fans into custom engine builds and performance cooling systems. This harness simplifies the installation process by bundling the relay, wiring terminals, and protective connectors into a single, organized package. Whether upgrading a classic hot rod, street machine, or modern custom build, this harness eliminates guesswork and reduces installation time by providing factory-quality routing and terminal connections.

The harness incorporates dual-capacity relays rated for both 30 and 40 amp applications, allowing flexibility across different fan motor sizes and electrical demands. The integrated relay protects your electrical system by isolating high-current fan draws from the vehicle's primary wiring and dashboard controls, preventing voltage drop and switch degradation. Pre-formed wiring with sealed terminals ensures corrosion resistance and reliable connectivity under engine bay conditions. The modular design accommodates both single and dual-fan configurations, making it compatible with most Spal electric fan units commonly used in street rods, muscle cars, and custom cooling setups.

Builders and engine shops benefit from this harness when retrofitting older vehicles with modern electric cooling or upgrading undersized factory fans. Installation is straightforward—the included terminals connect to battery positive, ignition switch, fan motor, and ground with minimal additional components required. The compact form factor (5.5 x 2.4 x 6.7 inches) fits neatly behind the radiator support or along engine bay walls. DeWitts Radiator wiring harnesses are engineered to outlast the vehicles they're installed in, making this an investment in reliable cooling system performance for decades of driving enjoyment.