Alternator 1-2″ Single Foot Dual V Pulley Regulator & Temp Sensor – 170A Kit – 12V 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: 1-2″ Single Foot Dual V Pulley Regulator & Temp Sensor 170A Kit 12V