This JD1912 automotive relay harness is engineered for reliable power switching in vehicles and marine applications. Operating at 12V DC with a robust 40A current capacity, this 4-pin SPST relay features color-coded wires for foolproof installation and maintenance. The compact design measures approximately 1.1 inches wide by 1 inch deep, with a total wire length of 5.2 inches, making it suitable for tight spaces. The sealed construction shields internal components from moisture and debris, ensuring consistent performance in demanding environments. Perfect for use in cars, trucks, vans, motorcycles, and boats, this relay harness provides straightforward connectivity through its standardized socket design. The mounting bracket allows secure installation, while the clear wire labeling system prevents connection errors during setup. Built to handle low-power contact loads, this relay harness delivers dependable switching for various automotive electrical applications.