This is a genuine Ford D4NN10316A 12-volt external alternator regulator, designed for reliable performance in a wide range of Ford agricultural tractors including the 2000, 3000, 4000, 5000, 7000, 8000, and 9000 series. It ensures stable voltage output for the charging system, protecting electrical components and maintaining optimal battery health. This A-circuit regulator is a direct replacement for the original unit, built to OEM specifications for perfect fitment and long-lasting durability.