Upgrade your vehicle's electrical system with the JD1912 Automotive Relay, a high-performance 12V 40A 4-pin relay designed for durability and reliability. Built with a sturdy iron bracket, this relay ensures secure mounting and stable operation in various automotive applications, including cars, trucks, vans, motorcycles, boats, diesel engines, starters, and more. Engineered for high-current switching, this relay supports up to 40A load capacity, making it ideal for demanding electrical setups such as fuel pumps, water pumps, trunk solenoids, security systems, and other automotive accessories. The 4-pin design features clearly labeled terminals (30, 85, 86, 87) for easy installation, ensuring compatibility with a wide range of 12V systems. Constructed with materials, the JD1912 relay delivers consistent performance under extreme conditions, resisting heat and vibration for long-lasting use. Whether you're upgrading an existing system or installing new electrical components, this relay provides a dependable solution for efficient power distribution. Compact yet powerful, it's a must-have for DIY enthusiasts and professionals alike, offering seamless integration into automotive, marine, and industrial applications. Enhance your vehicle's functionality with a relay that combines strength, precision, and versatility.