Specs: Unit Type: Alternator, Voltage: 12, Rotation: CW, Amperage: 42, Pulley Class: V1, Regulator: IR, Fan Type: EF Compatible with/Replacement for AC DELCO: 321-621, API MARINE: 20051, 20054, ALT50, ALT51, ARCO MARINE: 20102, 20103, ARROWHEAD (OLD): 400-12002T, ARROWHEAD: 400-12007, BARSANCO: 110-7127MAR, CARGO: 111250, CATERPILLAR: 655381, DELCO: 1100576, 1100577, 1100619, 1100654, 1100666, 1100721, 1100722, 1100732, 1100806, 1100894, 1100912, 1100914, 1100915, 1102393, 1102496, DIXIE: MA-100, MA-101, EMP PARTS: 4-5956, FAMILY: 10DN, 10SI 1-year warranty protects you after your purchase. We're confident that our products will work flawlessly once installed in your vehicle. But in a rare case that it does not, we'll replace it anytime within one year of your order. If you have a problem, we will take every step to assist you, contact us for a replacement. 100% New aftermarket Alternator built to meet OEM specifications for Crusader Replaces OEM Numbers: Arrowhead: ADR0105