Possible malfunctions and how to fix them (Skoda Kodiaq NS7)

Malfunction	Cause	Solution
Low voltage in the vehicle's on-board network at the rated engine crankshaft speed.	The alternator drive belt tension is loose.	Tension the alternator drive belt according to the operating instructions.
	Contamination of the slip rings of the AC generator rotor.	Clean the contact surfaces of the slip rings of the AC generator rotor.
	Wear and sticking of brushes in brush holders.	Check the height and free movement of the brushes. Replace if necessary.
	Rectifier bridge malfunction.	Replace the rectifier bridge.
	Alternator wiring circuit failure.	Check the condition of the alternator wiring circuits and repair any damage.
	Voltage regulator failure	Replace the voltage regulator
Excessive voltage in the vehicle's electrical system.	Short circuit in the brush assembly of the alternator.	Eliminate the short circuit and replace the brush assembly if necessary.
Excessive voltage in the vehicle's electrical system.	Voltage regulator failure.	Replace the voltage regulator.
Voltage fluctuations in the on-board network of a vehicle under load.	Slippage of the drive belt relative to the alternator pulley.	Tension the alternator drive belt according to the operating instructions.
	Poor electrical contact in the excitation circuit.	Check the excitation circuit and connection reliability.
Increased noise level when the alternator is running.	Loose alternator drive pulley.	Tighten the alternator drive pulley retaining nut.
Increased noise level when the alternator is running.	Wear of bearing parts or their destruction.	Replace damaged parts.
The electric starter does not turn.	The battery is not charged sufficiently.	Charge the battery.
	Violations in the electrical wiring connection.	Check the condition and fastening of power wires.
	The electric starter is faulty.	Check the technical condition of the electric starter.
	The ignition switch is faulty.	Check the ignition switch and replace if necessary.
The electric starter does not develop the required rotation speed to start the vehicle engine.	The battery is not charged sufficiently.	Charge the battery.
	Violations in the electrical wiring connection.	Check the condition and fastening of power wires.
	The electric starter is faulty.	Check the technical condition of the electric starter.
The electric starter continues to operate after the engine has started.	Electric starter overrunning clutch malfunction.	Check the electric starter overrunning clutch and replace if necessary.
	The ignition switch is faulty.	Check the ignition switch and replace if necessary.
	The electric starter traction relay is faulty.	Replace the electric starter solenoid relay.
The electric starter works, but the engine crankshaft does not rotate.	Damage to the teeth of the electric starter overrunning clutch or the flywheel ring gear.	Replace damaged assemblies.
	Electric starter traction relay malfunction.	Replace the electric starter solenoid relay.
The engine does not start or starting is difficult.	The ignition switch is faulty.	Check the ignition switch and replace if necessary.
The engine does not start or starting is difficult.	The contacts of the connecting connectors are damaged.	Check the contacts of the connecting connectors.