Q: Battery keeps dying and is corroded. Is it the alternator or the battery?

asked by on

Battery keeps dying and is corroded. Is it the alternator or the battery>
My car has an automatic transmission.

The corrosion may have an impact on how well the battery connection transfers the charge from the alternator. It is also possible that you may have a faulty alternator or a weak battery that is not able to take a charge. As you may know, the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while the engine turns the alternator. The voltage regulator is a unit that regulates the charging of the battery by the alternator and maintaining a certain amperage while the engine runs. When the alternator is not working properly, this may result in the battery quickly losing charge and the car losing all power as you have described. I would recommend having an expert from YourMechanic come to your location to diagnose and repair your charging system.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Battery keeps dying and is corroded. Is it the alternator or the battery?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: What would cause the battery to drain. car does not start when it's warm.

Hello. There are many things that can cause a battery to drain even when the car is off. If any live wire on the vehicle, there are many, short to ground then they can complete a circuit that will place...

Q: New battery and car still won't start.

If there is a problem with the starting system, the car may not start due to a problem with the battery, alternator, and/or starter. It is possible that the car will not start even when the battery is new if...

Q: My car battery will not hold a charge

Hello. This is likely related to a charging system problem. Since you have replaced the battery and the alternator, I would suggest checking the voltage regulator, which is a unit that monitors the voltage that the alternator provides to the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.