Yujie electric four-wheeled vehicle has no voltage12v.

There may be many reasons why Yujie electric four-wheel vehicle does not have 12 volts, such as insufficient battery power, circuit failure, controller failure and so on. I suggest you check whether the battery is fully charged first. If the battery is fully charged, but there is still no voltage output of 12 volts, you can ask professional maintenance personnel to detect the maintenance problem. Do not open the vehicle for maintenance and operation to avoid potential safety hazards.