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Do you have a GY6 Qmb139 or Qmj157 engine and want to test or learn how your ac or dc charging system and ignition works and what is best, this video is a must. I will teach you the difference between AC and DC voltage on a charging system and ignition system. We will go over stators and how many poles are best, magnetos, pickup coils along with ignition coils and CDI boxes. We will show you have a rectifier regulator converts ac to dc and sends the charge back to the battery. This video is a full how to and learning process. It’s also very important you learn what’s the difference between alternating current and direct current.