This starter relay solenoid is compatible with models including 400, 500, 570, 700, 800, 900, 1000, Crew, RZR, and Trail Boss 330, covering model years 2004 to 2022.Constructed with copper and EPDM materials, it operates at 12V.Terminal designation: B for , M for motor—do not reverse connections.Designed to support cranking power and reduce current load on the starter switch.Made with metal, plastic, and aluminum components.Replaces OEM part numbers 4012001 and 4010947.Package includes one starter relay.