Upgrade your vehicle's electrical system with the JD1912 Automotive Relay, a high-performance 12V 40A 4-pin relay designed for durability and reliability. This versatile relay is engineered to handle high-current applications, making it ideal for cars, trucks, vans, motorcycles, boats, diesel engines, starters, and more. Built with a sturdy iron bracket for secure mounting, this relay ensures stable performance in demanding conditions. Its 30/40 amp switch rating and 12V (max 14V) compatibility make it perfect for powering electric fuel pumps, water pumps, trunk solenoids, security systems, and other automotive setups. The clearly labeled terminals (30-high power common pin, 85-coil ground, 86-coil trigger wire, 87-high normally open contact) ensure easy installation. Whether you're upgrading your vehicle or replacing a worn-out relay, the JD1912 delivers consistent power transfer and long-lasting performance. Designed for universal compatibility, this relay is a must-have for automotive enthusiasts and professionals alike. Trust in its robust construction and efficient operation to keep your electrical systems running smoothly.