This means that the electric vehicle is still charging, but the charging interval is getting longer and longer, that is, the terminology says that the duty cycle is getting larger and larger, and you need to wait;
The pulse state refers to the charging stop, now the best is the frequency conversion pulse;
It may also be because the connection line is not properly connected;
But if the flash is very irregular, it may be that the charger is broken;
It may also be because of excessive battery discharge, resulting in too low battery voltage, the charger can not be started, you can first charge 24-32 hours after observation;
Or the internal power loss of the tram is too heavy, resulting in a voltage lower than the safe charging voltage;
Generally need to charge 1 hour try, probably will be good;
No longer open the charger, see if the fuse is burned, if burned, change the same specification of the fuse. Other than that, the average person can't fix it.