Balmar Alternator 170 AMP 12V 4" Dual Foot Saddle K6 Pulley [XT-DF4-170-K6]Alternator 170 AMP 12V 4" Dual Foot Saddle K6 Pulley Balmar offers a wide range of alternator power upgrades designed specifically for marine industry applications. They install high reliability bearings, robust rectifier diodes, and improved heat sinking capabilities on all their alternators to ensure improved system reliability combined with increased charging power. Features: 4" Dual Foot K6 Serpentine Pulley 170A 12V Case Ground J 180 Mount;