This is a circuit fault around the battery. If the battery is three or four years old, it is essentially a faulty battery. If the generator is broken, you can replace the whole thing. It depends on where the problem is. Sometimes the belt is broken. Sometimes this is an internal problem and it may be best to replace the regulator.
Since the cruising range of low-speed electric tricycles is still relatively limited and cannot fully meet the daily travel needs of the public, if you want to increase its cruising range, you can install a range extender to increase its range. The cruise range expands its range of activities, meets the daily travel needs of the public and allows them to come and go freely, without the difficulty of running out of energy halfway.
Detailed information:
Use two dry batteries in series with the battery and ammeter, and connect them to the battery terminal of the air conditioner. Start the engine and gradually increase the speed. When the voltage regulator is working, check the ammeter needle. If the ammeter pointer swings in the “+” direction, it means that the voltage regulation value is high, and the spring tension should be reduced; if the ammeter pointer swings in the “-” direction, it means that the voltage regulation value is high; low and the spring tension should be increased. Repeat this adjustment until the voltage regulator takes effect and the ammeter needle barely oscillates, indicating that the voltage regulation value is appropriate.
Baidu-Regulator Encyclopedia