The ground wire of the car battery is generally connected to the frame. There are many connections from the ground wire to the starter casing. The loosening and detachment of the connection parts and the oxidization of the metal in the parts will cause poor contact and can easily cause poor contact failure of the starter circuit. Due to poor circuit contact, a large voltage drop occurs when the vehicle starts to pass a large current, which results in a decrease in the starting rotation speed and an inability to start. In this case, first check the battery pole, if it has been oxidized or connected to the wire chuck rust, and there is a sense of hot, should remove the battery, wash the surface with an alkaline solution (warm water), and then wipe clean, and then use emery cloth Erasing rust dirt, put the chuck. If during the operation of the engine, the gasoline pipe is in contact with the cylinder body, or when the starter cranks the crankshaft manually, a spark is found around the handle, indicating that the girder and the engine support bolts are loose, or the battery is connected to the starter. Poor contact between shells. When cranking, the starting current is generated by the frame, handle handle and engine to generate sparks. When this happens, the line connection should be searched piece by piece for looseness. If necessary, measure the terminal voltage with the instrument. The starter fire wire terminal is also easy to loose and bad contact, remove the starter magnetic switch for maintenance.
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