Balmar Alternator 1-2in Single Foot J10 Serpentine Pulley - 170A - 12V One Size. 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. Specifications for Balmar Alternator 1-2in Single Foot J10 Serpentine Pulley: Manufacturer: Balmar Color: Black Amperage: 170 amps Voltage: 12 volts Features of Balmar Alternator 1-2" Single Foot J10 Serpentine Pulley 1-2" Single Foot J10 Serpentine Pulley 170A 12V Package Contents: Balmar Alternator 1-2" Single Foot J10 Serpentine Pulley Balmar XT-SF-170-J10: Alternator 1-2in Single Foot J10 Serpentine Pulley - 170A - 12V One Size