Alternator 170AMP, 12V, Vortec Mount, K6 Pulley with Internal Regulator & Isolated Grounding Balmar offers a wide range of alternator power upgrades designed specifically for marine industry applications. Balmar installs high reliability bearings, robust rectifier diodes and improved heat-sinking capabilities on all our alternators to ensure improved system reliability combined with increased charging power.Features:Vortec Internal Reg K6 Serpentine Pulley170A12VInternal RegulatorIsolated Grounding