Sierra 18-5827 Regulator/Rectifier The Sierra 18-5827 Regulator/Rectifier is interchangeable with the following: CDI 193-4476, Evinrude/Johnson 585001, 584476, Mallory 9-17202. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Regulator/Rectifier Meets or exceeds the original equipment quality Sierra part number: 18-5827 Interchangeable with the following: CDI 193-4476, Evinrude/Johnson 585001, 584476, Mallory 9-17202