Balmar alternator family featuring a 3.15" Dual Foot Saddle and J10 serpentine pulley, rated at 170A and 12V for marine applications. Balmar installs marine-grade bearings, robust rectifier diodes and improved heat-sinking to improve system reliability and charging performance. These alternators are offered as high-reliability power upgrades for marine charging systems and related applications. This product may not be returned to the original point of purchase; please contact the manufacturer directly with any issues or concerns.