{"product_id":"spal-40a-fan-harness-with-relay-universal-12v-wiring-kit-fused-battery-lead","title":"Spal 40A Fan Harness with Relay — Universal 12V Wiring Kit, Fused Battery Lead","description":"\u003cp\u003e\u003cstrong\u003eSpal's 40 Amp Fan Harness with Relay is a ready-to-install wiring kit that lets you control a high-current electric fan safely and reliably.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned for universal fit applications, this pre-assembled harness from Spal simplifies wiring an electric cooling fan, replacing homemade splices and fragile inline switches. The kit routes power through a heavy-duty 40 amp relay and includes the connectors and mounting points needed to integrate with most aftermarket and factory fans. It reduces strain on existing wiring, protects switches from burnout, and helps ensure consistent fan operation under load.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this harness protect my vehicle's electrical system?\u003c\/h3\u003e\n\n\u003cp\u003eThe harness routes high current through a dedicated 40 amp relay so the fan draws power directly from the battery rather than through a dash switch or fragile factory wiring. That prevents overheating of thin wires and reduces voltage drop at high fan speeds. The result is safer operation and longer component life.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e40 amp relay carries heavy loads without overheating\u003c\/li\u003e\n  \u003cli\u003eDirect battery feed minimizes voltage drop\u003c\/li\u003e\n  \u003cli\u003ePlug-and-play connectors reduce risky wire splices\u003c\/li\u003e\n  \u003cli\u003ePre-mounted relay simplifies secure installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat components are included and how easy is it to install?\u003c\/h3\u003e\n\n\u003cp\u003eThe harness comes pre-assembled with the relay, fused power lead, ground wire, and factory-style connectors to mate with many electric fans. Installation typically requires mounting the relay, connecting the fused power lead to the battery, grounding the harness, and plugging the fan connector into the fan motor. Basic hand tools and a multimeter are recommended for a safe, correct fit.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePre-wired relay with mounting tab for easy attachment\u003c\/li\u003e\n  \u003cli\u003eFused battery lead for overload protection\u003c\/li\u003e\n  \u003cli\u003eGround lead and compatible fan connector included\u003c\/li\u003e\n  \u003cli\u003eUniversal fit design works with most aftermarket fans\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this harness work with my fan and vehicle type?\u003c\/h3\u003e\n\n\u003cp\u003eSpal's universal harness is built to accommodate a wide range of 12V electric fans used in cars, trucks, and performance builds. Confirm connector compatibility and ensure your fan's current draw does not exceed 40 amps. If your application draws near or above 40A continuous, consider a higher-capacity relay or dual-relay setup.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUniversal fit for most 12V electric fans\u003c\/li\u003e\n  \u003cli\u003eDesigned for applications under 40 amps continuous draw\u003c\/li\u003e\n  \u003cli\u003eCheck connector pin layout for exact match\u003c\/li\u003e\n  \u003cli\u003eWorks in cars, light trucks, and custom builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDoes the harness include safety features and specifications?\u003c\/h3\u003e\n\n\u003cp\u003eThe wiring kit includes a fused power lead and a heavy-duty relay to reduce the risk of electrical faults. Package dimensions and weight make it compact for storage and shipping. The harness is produced in China to Spal's quality standards and is intended for automotive use only.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncludes inline fuse on battery feed for added protection\u003c\/li\u003e\n  \u003cli\u003e40 amp relay rated for high-current switching duties\u003c\/li\u003e\n  \u003cli\u003eCompact package dimensions for easy stowage and shipment\u003c\/li\u003e\n  \u003cli\u003eManufactured to Spal's production specifications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? Technicians, DIY enthusiasts, and performance builders who want a reliable, ready-made wiring solution for electric cooling fans will benefit from Spal's 40 Amp fan harness. It's ideal when upgrading to a high-flow aftermarket fan, replacing a worn factory harness, or adding an electric fan to a radiator conversion. If you need a straightforward, serviceable harness that cuts installation time and reduces electrical risk, this kit is a practical choice.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is the Spal 40A harness plug-and-play?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, it is pre-wired with common fan connectors and a mounting relay, but verify connector fit and battery fuse placement before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can this harness handle all electric fans?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It supports most 12V fans under 40 amps. For fans drawing more than 40A, use a higher-rated relay or dual-relay setup.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Spal","offers":[{"title":"Default Title","offer_id":67586691367097,"sku":"B003PB4AY8","price":141.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/spal-fan-harness-front-packaging.jpg?v=1790490158","url":"https:\/\/redleafauto.ca\/products\/spal-40a-fan-harness-with-relay-universal-12v-wiring-kit-fused-battery-lead","provider":"Redleaf Auto","version":"1.0","type":"link"}