This manual provides comprehensive technical information for the 2004 Softail family of motorcycles, including the Heritage Softail Classic ST, Fat Boy ST, Softail Standard, Night Train ST, Softail Deuce, and Softail Springer models. It is designed to assist owners and technicians in understanding and maintaining these iconic machines, renowned for their distinctive styling and robust performance. The included supplement for the FXSTDSE2 Screamin Eagle Deuce ensures complete coverage for this special edition model. The scope of this manual encompasses all essential aspects of vehicle service and repair. It details maintenance procedures, chassis components, engine systems, fuel delivery, drivetrain, transmission, and electrical systems. The electrical diagnostics section further covers starting and charging systems, instruments, and engine management. With detailed diagrams, illustrations, photographs, and step-by-step instructions, this resource facilitates efficient troubleshooting and accurate repairs, empowering users to perform necessary upkeep and resolve issues effectively.