You already mentioned the reason, which is that the iron to ground is shorted, resulting in excessive charging. The current in the generator winding circuit is very large. The higher the current, the greater the heat and of course. it will burn.
No electrical charge can exceed its nominal value. It's the same as a person. If you put a thousand kilos of weight on him, he will be crushed, crushed and crushed to death.
How to connect the alternator live and neutral wires
Cause:
The car alternator connection line to the battery becomes hot, which has both potential internal and external causes. In one case, the internal cause is that a large current is flowing, and the current dissipates heat and makes the transmission line hot. Another reason is that other heating units make the transmission line a good conductor of heat. heat during transferert of heat, its own temperature increases and becomes hot. ?
The two reasons above are easy to troubleshoot. Use an infrared remote temperature sensing gun to measure the temperature of the generator and battery near the wire and directly connected to the wire to see if it is within a reasonable range. range.
At the same time, an ammeter is connected in series to the transmission line to measure the average current. When the current is abnormal, the most likely cause is the change in the internal resistance of the battery. At this point, it is necessary to determine whether the battery defect is repairable or irreparable, then repair and replace it. It is not excluded that there are other circuit problems, and detailed investigation can be carried out from the source, transmission line and load end.
Detailed information:
Precautions forautomobile generators:
1. Frequently clean the scale and dust on the surface of the generator. . Keep it clean and well ventilated.
2. Frequently check the tightening conditions of the generator-related fasteners and tighten the screws in time.
3. The tension of the drive belt must be appropriate. If it is too loose, it will slip easily and result in insufficient power production; if it is too tight, it will easily damage the belt and generator bearings.
4. When installing the battery, be careful not to install it incorrectly. Usually, install the positive wire first and not the ground wire, otherwise the diode will burn out easily.
5. When using an integrated circuit regulator, the ignition switch should be turned off immediately when the engine is not running.
6 It is never permitted to use the “scratching” method totest whether to produce electricity.
There are four wires coming out of the generator, which should be three live wires and one neutral wire. One end of the three live wires is the live wire and the other end is the live wire. the ground wire and the neutral wire.
Generally, several wires or terminals of a generator have prescribed markings. After servicing the generator, the generator wiring should be connected correctly according to the brands.
When generator lead wires or terminals are not marked, or the markings are unclear, or the meaning of the markings is forgotten, the following methods can be used to identify the generator wires. earth.
1. Fire test method. When the generator is working normally, use a wire to scratch. If sparking occurs when a certain wire is scratched against the other two wires, then the wire is the ground wireand the other wires are for.Live line.
2. Voltmeter measurement method. When the generator is operating normally, connect the test lead on one end of the voltmeter to one of the lead wires and connect the other lead to the other lead wires. The voltage between the ground wire and the live wire is less than the voltage. between two live wires. For example, if the voltage between a certain wire and other wires is around 6 volts, the wire is a ground wire. If you don't have a voltmeter, you can also use a 12 volt bulb (the voltage is too low and the bulb is easy to burn out), connect it to the two lead wires and determine the voltage. depending on the brightness of the light. When the ground wire and the live wire are connected, the light is darker, and when the two live wires are connected, the light is brighter.