1, the charger converter is damaged, can not be converted and charged, replace the charger resistor. 2, battery welding, check with a multimeter. 3, the charger insurance burned out, replace the charger. 4, power cord and battery socket fall off, poor contact, check and replace.
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How to protect electric car charger:
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1. Add 15ML pure water to the battery, charge it with a 4 amp current, charge it until the current drops to 1 amp, park it for 2 hours, measure the voltage of each battery is 13.3, if a certain battery is not charged, reach it. Then string the batteries together, and you're done