Skip the auto shop - Our mechanics make house calls

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.

A: The corrosion may have an impact on how wel...

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 1000 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!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: New battery dead and doesnt take charge

This may be a sign of a weak battery, a failing voltage regulator or failing alternator. If the battery was charged at one point, used and then sat for a couple of months without activity following this, this may have...

Q: How long does it take to install an alternator in a 1982 Toyota Tercel

Hello, thank you for writing in. An alternator replacement typically takes around an hour. This is dependent of course on the condition of the old unit and how difficult it is to remove. The tools needed are fairly basic. The...

Q: Truck not starting.

A faulty fuel pump can cause the engine to turn over and not fire up and leave no faults in the engine computer. While cranking listen for fuel pump operation. If no fuel pump operation then the pump or relay...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.