Automatic Cooling Control for A/C-Triggered Fan Operation

Consistency in cooling performance starts with reliable wiring — and the SPAL Electric Fan Relay Wiring Kit (FRH) delivers exactly that. Designed specifically to activate your SPAL fan when the vehicle’s air conditioning system engages, this plug-and-play relay harness provides OEM-grade function, protection, and simplicity in one compact package.

Built around a 40-amp relay, fused power circuit, and weather-resistant wiring, this kit ensures your SPAL electric fan powers on automatically under A/C load conditions, keeping condenser temperatures low and airflow consistent. It’s the professional solution for clean, automatic fan activation without the need for manual switches or complex controllers.

Whether you’re wiring a single fan on a daily driver or adding A/C-triggered cooling to a custom build, this SPAL harness simplifies the process while maintaining the reliability that SPAL systems are known for.

Engineered for Dependable Cooling Control

The FRH relay kit is more than just wiring — it’s a complete power management system designed to handle high-current electric fans while protecting your electrical system. The included pre-wired relay, inline fuse, and dedicated trigger lead work together to provide clean, isolated switching.

When the air conditioning clutch circuit energizes, the relay closes instantly, activating your SPAL fan to increase condenser efficiency and maintain steady A/C performance — even in high ambient temperatures or stop-and-go traffic.

With its universal 12V design and high-quality automotive wiring, this kit integrates seamlessly into SPAL fan systems and most aftermarket or OEM A/C setups.

Technical Specifications

Key Features

• Automatic A/C Activation: Turns your fan on when the vehicle’s air conditioning engages for consistent cooling.

• Pre-Wired 40A Relay: Ensures safe, reliable power delivery to your SPAL fan motor.

• Integrated Inline Fuse: Protects the circuit and prevents overload or wiring damage.

• OEM-Grade Construction: Uses high-temperature wire and sealed connectors for long-term durability.

• Universal 12V Compatibility: Works with most SPAL and aftermarket cooling fans.

• Simplified Installation: Pre-terminated leads and color-coded wiring reduce setup time.

• Designed by SPAL: Engineered to meet the same quality and reliability standards as their world-class fans.

How It Works

The SPAL FRH Wiring Kit uses a dedicated trigger wire that connects to the A/C clutch circuit or relay output. When the A/C system engages, the trigger wire energizes the relay coil, closing the circuit between the battery and the fan motor.

This automatic operation provides consistent airflow across the condenser, improving cooling system performance without driver input. When the A/C system turns off, the fan deactivates automatically, maintaining efficiency and reducing electrical load.

⚙️ Basic Circuit Overview:

• Red Wire: Battery 12V feed (fused)

• Black Wire: Ground

• Yellow Wire: A/C trigger or switched ignition input

• Blue Wire: Output to SPAL fan motor

Application

This relay harness is ideal for:

• A/C condenser fan systems on street vehicles

• Auxiliary cooling fans for radiators or intercoolers

• Custom cooling setups where automatic A/C activation is needed

Compatible with all SPAL 12V single-fan models up to 30 amps, including Standard and High-Performance Series. Perfect for street rods, off-road builds, or custom performance vehicles requiring A/C-dependent airflow management.

Installation Notes

Installation requires only four basic connections — power, ground, trigger, and fan output. The harness is pre-terminated for SPAL-style fan connections but can be adapted for universal 12V fans if needed.

⚙️ Tips for Optimal Setup:

• Mount relay near power source to minimize voltage drop.

• Always route wiring away from heat sources and moving components.

• Use proper wire grommets and heat shrink for clean, professional installation.

• Verify correct polarity before powering on the fan.

Why Choose SPAL

SPAL Automotive has set the benchmark in cooling fan technology for decades, supplying OEMs, motorsport teams, and builders worldwide. Their wiring kits are designed with the same precision, ensuring dependable electrical performance and ease of installation.

With the FRH relay kit, you’re not just buying a wiring harness — you’re getting SPAL’s engineering expertise built into every component, from wire gauge to terminal crimp.

The Fenix Motorsports Advantage

At Fenix Motorsports, we select products that align with one simple standard — proven performance. SPAL’s wiring and fan systems are trusted in the toughest environments, from desert racing to high-performance street builds.

• Real-world tested in performance and off-road applications

• Fast, secure U.S. shipping

• Backed by Fenix’s technical expertise and support

• Trusted by fabricators and enthusiasts nationwide

Why Buy from Fenix Motorsports

We don’t just sell components — we build with them. Every SPAL product we offer is selected for its performance, reliability, and ease of integration. Whether you’re wiring a street car or designing a high-efficiency cooling system for competition, we’ve got the right parts and the know-how to support your build.

Fenix Motorsports — Performance Driven Since 2021.