What causes the alternator to go bad?

Troubleshooting Car Problems: Alternator vs. Starter

What causes the alternator to go bad? Car electrical issues often involve the alternators and the starters. They're both critical for vehicle operation, but they serve different roles. Knowing the common causes of failure and how to distinguish between them can be both time and cost-effective.

Causes of Alternator Failure

1. Worn Bearings: Constant rotation may wear out the alternator's internal bearings, leading to noise, overheating, and failure.
2. Faulty Diodes: Diodes convert AC to DC current. Their malfunction can result in inconsistent battery charge, causing electrical problems.
3. Improper Charging: A malfunctioning voltage regulator may cause overcharging or undercharging of the battery, potentially leading to damage or drainage.
4. Belt Issues: An unfit belt can result in inadequate performance or total failure of the alternator. It's essential to regularly inspect the belt for signs of wear and tension.

Causes of Starter Failure

1. Electrical Issues: Problems with wiring, corroded connections, or a damaged solenoid can hinder the starter from receiving sufficient power or engaging properly.
2. Wear and Tear: Constant use may wear out the starter motor parts like brushes, armature, or drive gear, which may ultimately fail and want a replacement.
3. Engine Overheating: Heat can cause the starters to malfunction due to its proximity to the engine, often due to a cooling system failure or prolonged engine overheating.
4. Inadequate Battery Power: A weak battery may not provide sufficient power to engage the starter, so confirming the battery's condition is crucial before suspecting a starter problem.

Distinguishing Alternator from Starter Problems

1. No Power: If your car won't start and shows no power signs, it's likely an alternator issue.
2. Clicking Sound: When turning the key, a clicking sound generally signifies a faulty starter, indicating the solenoid is engaging but not rotating the engine.
3. Dimming Lights: If the car starts, but the lights dim significantly, it may point to an alternator problem due to improper battery charging.
4. Jump-Starting: If a jump-start gets your car running, the problem is probably with the battery or alternator. If it doesn't work, suspect faulty starters.

Conclusion

What causes the alternator to go bad? Understanding the causes of alternator and starter failures and recognizing the signs aids in effective car troubleshooting. However, always consult an expert mechanic for accurate diagnoses and reliable repairs.

Wondering what causes the alternator to go bad? Contact our ASE Certified Technicians at Gary's Quality Automotive for more information about your car starter, battery, and alternator and to schedule an appointment. Our auto repair shop proudly serves vehicle owners in Grand Island, NE, Wood River, NE, and Doniphan, NE.