Possible reasons:
1. Defective battery
* A weak or discharged battery does not provide sufficient voltage for stable operation of the electrical system.
* Check the battery voltage using a voltmeter. There should be at least 12.6 volts with the engine off and 13.5-14.5 volts with the engine running.
2. Faulty generator
* The generator converts the mechanical energy of the engine into electricity to power the electrical system.
* A faulty alternator may not provide sufficient charging current, causing flickering.
* Check the generator voltage with a voltmeter while the engine is running. It should be around 13.5-14.5 volts.
3. Wiring problems
* Loose or damaged connections in wiring can cause unstable voltage, resulting in flickering.
* Check all battery terminals, alternator terminals and ground connections.
4. Faulty voltage regulator
* The voltage regulator regulates the voltage produced by the generator.
* A faulty voltage regulator can cause voltage surges, resulting in flickering.
5. Faulty lamps or devices
* Faulty or damaged lamps or devices may draw too much power, causing the electrical system to overload and flicker.
* Check all lamps and devices for signs of damage or malfunction.
6. Faulty engine control unit (ECU)
* The ECU controls and coordinates the operation of various electronic systems.
* A faulty ECU can disrupt the electrical system and cause flickering.
Diagnosis and elimination:
* Check the battery and alternator.
* Inspect wiring for loose or damaged connections.
* Check the voltage regulator and replace it if necessary.
* Check lamps and devices and correct any faults.
*If the problem is not resolved, consult a qualified mechanic for further diagnosis.