1)\tThe connection of the additional resistance of the ignition coil is broken or the additional resistance itself is burnt out (ignition coil with additional resistance).
(2)\tThere is an open circuit between the ignition switch "I" terminal and the ignition coil "+" terminal.
(3)\tPoor ignition switch contact.
The fault diagnosis method is as follows：
Check the ignition switch
Turn on ignition switch, see if the charging indicator is on. If the charging indicator is not work, it indicates the contact point of the ignition switch is not in good condition, the ignition switch should be repaired or replaced. If the charging indicator is on, then proceed to the next step of fault diagnosis.