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SPELAB 4 Pieces Ignition Coil Pack Principle When the primary coil is connected to the power supply, a strong magnetic field will be generated around with the increase of current, and the iron core will store the magnetic energy; when the switch device disconnects the primary coil circuit, the magnetic field of the primary coil will rapidly decay, and the secondary coil will induce a high voltage. The faster the magnetic field of the primary coil disappears, the greater the current at the moment of current disconnection, and the greater the turn ratio of the two coils, the higher the voltage induced by the secondary coil. Pay Attention If the ignition coil is used improperly, it will cause damage to the ignition coil. Therefore, the following points should be paid attention to: prevent the ignition coil from being heated or damped; do not turn on the ignition switch when the engine is not running; frequently check, clean and fasten the circuit connector to avoid short circuit or grounding; control the engine performance to prevent high voltage; do not hang the spark plug for a long time; moisture on the ignition coil Only dry with cloth, never bake with fire, otherwise the ignition coil will be damaged.