Spyke Heavy Duty 32 Amp Charging System For Harley Big Twin Features Features a forged steel rotor with a thicker spline for maximum engagement The magnets are encapsulated in a protective barrier to resist vibration-related breakage and prevent costly damage The kit includes a high performance, thick-gauge stator winding with three-rib plug and durable solid-state chrome voltage regulator Not for use on EFI models