The charging system of a motorcycle is composed of a magneto, a rectifier regulator, and a battery. Because of the problem of one of these components, it will be manifested as battery loss, electric failure, and the replacement of these parts with repair methods is not something that every repair shop can easily do. In case of misjudgment, the problem is not solved. It will also bring about an economic dispute. The function of the rectifier regulator is to rectify the AC output of the magneto motor to a suitable DC to charge the battery. Because its technical indicators are relatively strict, and because the short-circuit voltage regulation method is inaccurate when the battery is disconnected, it is a difficult problem for the maintenance personnel. Here is the easiest way to detect the voltage regulation value of the short-circuit rectifier regulator: buy one The 35 volt 6800 microfarad capacitor is connected to the battery charging line, start the car, open the battery, add the throttle, measure the DC voltage across the capacitor, the 6 volt car is normal at 7.2 volts, and the 12 volt car is at 14 - 15.5 volts is normal (less than 14 volts will result in loss of power when the headlights are turned on, higher than 15.5 volts will overcharge the battery and shorten the life). The above can roughly determine whether the rectifiers can also directly measure the ends of the battery. Voltage and charging current (due to the large influence of the battery, it is easy to misjudge), the 6V car rises from 6.8 volts to 7.2 volts, and the 12 volt vehicle voltage rises from 12.7 volts to 14-15.5 volts, and the current gradually decreases. The voltage cannot drop when the headlights are normal. At present, the new switching rectifier regulator can measure the stable DC voltage, which is very intuitive. When the headlights are turned on, it is normal to increase the throttle voltage value within the specified range. The function of a motorcycle battery is to store electricity. This has a capacity problem and is the main cause of the difficulty in distinguishing faults. The faults are as follows: 1. The capacity is reduced. The charging voltage easily reaches about 15 volts (7.2 volts in 6 volts), but the voltage drops sharply when the electric start or the headlight is turned on. Second, there is a partial short circuit inside, the charging voltage is difficult to rise to the specified value, and the charging current is always Very large, after using the electric start several times, the power will not be available or after a period of time, the electric start cannot be used. Some are severely hot and the electrolyte dries quickly. The technical situation of the battery is more complicated, especially the new battery also has this phenomenon, making it impossible to start.
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The magnetoelectric motor needs to provide sufficient electric energy. It consists of a magnet rotor and a coil stator. The magnetic field strength of the magnet is affected by the performance of the magnet. The technical state of the coil, such as whether it is partially burned and short-circuited, localized grounding, disconnection, etc., is the most simple and straightforward. The method of judging is to start the car. The two-wire and three-wire models (such as fxd125, gs125, etc.) will directly cut the output line. When the idle speed is high, the spark is stronger, but the throttle is stronger. Sparks, otherwise there is a phenomenon of grounding, to check the reasons; two-line ground output models (such as jh70, Gwangyang Haomai 125, etc.), the output line should be strongly sparked on the ground line. The above phenomenon roughly indicates that the magneto motor output is normal. In addition, it is more intuitive to connect a 12v35w headlight directly to the output. If the throttle light is bright, the output of the magneto is basically normal. 
Analysis and solution of common problems in motorcycle charging system
Modern motorcycles basically have an electric start, so the charging system is important. In practice, many ambiguous failures have been found, which has caused trouble for many repairers and delayed the valuable time of the owners. Due to the repair of the charging system, it is not necessarily an immediate effect, the same phenomenon but different causes of failure, making many repairers puzzling. This is also due to the lack of dedicated instrumentation and lack of experience.