If the rotor does not ground, it should be a regulator problem.
Just change the regulator and you will be fine. It can be recharged, but you won't be able to use the generator for long!
For a multimeter, it must be greater than 13V. For an ammeter, it's obvious, I won't go into details.
Another reason is that electricity is generated but the indicator light is on. In this case, the line going from terminal N of the generator to the regulator is short-circuited, and there is then some re-flow in the current. iron line from the instrument indicator light to the regulator.
Detailed information:
Charging precautions?
1 . During charging, do not disconnect the battery or turn off the power switch, otherwise the plug and electrical components will be damaged. Only after switching off the charger can the plug be removed.and unplugged. Van.
2. When preparing the electrolyte, do not pour water into the sulfuric acid to avoid the temperature of the liquid surface rising suddenly and the boiling acid droplets splashing and injuring people. .
3. The battery will produce gas during the charging process. The charging area should be well ventilated and there should be no open flames nearby. ?
4. Under no circumstances should the temperature of the electrolyte during charging exceed 45°C. Otherwise, efforts must be made to cool it, for example by reducing the charging current, artificially cooling or suspending charging. . Wait for the temperature to drop. Then continue charging. ?
5. It is strictly prohibited to place metal tools on the battery, and no unnecessary debris is allowed on the battery.