Balmar > Alternators Alternator: 98-12-310-IG-BL Description Alternator: 98-12-310-IG-BL- 98 Series- 310A- 12V- Saddle Mount (Dual Foot)- 4in- Deep Dual Vee Pulley*- Isolated Ground, Brushless- 4" J-180-Style Mounting;  Typical for Caterpillar, Cummins, Detroit Diesel