Spal Fan Harness with 40A Relay — Universal Electric Cooling Fan Wiring Kit, Plug-and-Play Protection

The Spal Fan Harness with 40 Amp relay is a universal wiring kit designed to safely power electric cooling fans while protecting switches and simplifying installation.

This ready-to-install harness pairs a durable 40 Amp relay with appropriately gauged wiring and connectors so you can control an electric radiator or condenser fan without running high current through the dash switch. The kit is built for universal fitment, packaged compactly for easy storage, and ships from China. It balances straightforward wiring, reliable components, and a compact footprint to suit custom installs and replacement jobs.

How does this harness protect my vehicle’s switch and wiring?

The included 40 Amp relay takes the heavy electrical load off the dashboard switch so only a small control current flows through the switch contacts. That reduces heat, wear and the risk of a blown switch or burnt harness in high-current fan applications.

• 40 Amp relay handles continuous fan loads without overworking the control switch
• Properly sized wires reduce voltage drop and overheating
• Plug-and-play connectors avoid amateur splicing that can cause faults

What makes this a universal fit for different fan setups?

The harness is designed to work with a wide range of aftermarket and OEM electric fans by using standard relay and connector layouts. That flexibility lets you install it on many radiators, oil coolers or condenser fans without needing model-specific adapters.

• Standard relay footprint and terminals compatible with common fan wiring
• Versatile lead lengths to reach typical engine-bay mounting points
• Universal connectors that mate with many fan plug types or allow secure crimping

How straightforward is installation for a DIY mechanic?

Installation is kept simple: mount the relay to a chassis ground, connect the power lead to the battery or fused source, attach the fan leads, and wire the trigger to your switch or thermostat. Basic hand tools and a multimeter are usually all you need.

• Clear wiring layout reduces guesswork during installation
• Compact package dimensions make fitting the relay in tight engine bays easier
• Package includes harness weight and size details to plan mounting location

What electrical and packaging specs should I expect?

The harness uses a 40 Amp relay rated for automotive loads and arrives in a compact, lightweight package suitable for storage or shipping. Knowing these specs helps ensure compatibility with your fan’s current draw and available mounting space.

• Relay rating: 40 Amps — suitable for most electric cooling fans within that current range
• Package dimensions: 19.812 H x 7.366 L x 14.224 W centimeters
• Package weight: 0.748 kilograms; country of origin: China

Who is this for? The Spal 40 Amp Fan Harness with Relay is aimed at enthusiasts, mechanics and DIYers who need a reliable, universal wiring solution for electric cooling fans. It’s a practical choice if you want to offload fan current from dash circuits, streamline wiring for a new or replacement fan, or add a safer, organized relay setup to an existing installation.