Signs Your Alternator Might Be Failing
At MyMechanic, we understand how vital your alternator is to your vehicle’s overall performance. If it starts to fail, you may notice the following symptoms:
- Engine stalls while driving due to loss of electrical power.
- Dimming dashboard and headlights during operation.
- Difficulty starting the vehicle or frequent jump-starts due to a dead battery.
- Abnormal noises such as whining from the engine bay.
Common Causes of Alternator Failure
Undercharging: An undercharging alternator can cause dimming or flickering lights, a discharged battery, and difficulties starting the car. If the alternator fails while driving, the vehicle may stall. Modern cars may also display a check engine light or experience problems with onboard electronics.
Overcharging: Overcharging can lead to short bulb life and potential issues with onboard electronics. In modern vehicles, this could trigger a check engine light.
Bearing Noises: A failing alternator may still function but produce a high-pitched whirring noise that varies with engine RPM, indicating worn-out bearings inside the alternator.
How Does an Alternator Work?
The alternator is a key component of the charging system. It charges the battery and powers the entire vehicle while the engine runs. Without a functioning alternator, the car will quickly lose power.
The alternator generates electricity through electromagnetic induction. It consists of:
- A stator (stationary windings).
- A rotor (rotating electromagnet), driven by a belt connected to the engine crankshaft.
As the rotor turns, power is produced in the stator windings. Alternators generate alternating current (AC), which is converted to direct current (DC) through a diode rectifier bridge, ensuring the vehicle’s systems receive the correct power.
Modern cars have an engine control module (ECM) to adjust alternator output, while older models rely on a voltage regulator.
How to Troubleshoot Alternator Problems
If you suspect alternator issues, MyMechanic in Malaysia can assist with proper diagnostics. Key tests include:
- Charging Voltage: A fully charged alternator should produce 13.8 to 14.2 volts at idle (lights off).
- Amperage Output: Using a load tester and an inductive probe, the alternator’s amperage can be evaluated.
Additionally, a slipping or loose drive belt and an internally shorted battery should be checked, as both can affect alternator performance.
Trust MyMechanic for Alternator Replacement
In the past, alternators were often repaired or rebuilt. Today, they are more affordable and are typically replaced with new ones. At MyMechanic, Malaysia’s trusted car service provider, we ensure a quick and reliable alternator replacement to get your car back on the road safely.
