Q: When my alternator went out, could it have killed my battery?

asked by on

I just replaced my alternator today. On my way home the ABS and airbag light both came on and my radio and headlight began to dim then it just died. The emergency flashers wouldn't work either. The car wouldn't start so I got jumped and about 30 seconds to a minute later, same thing happened. And I forgot to mention that the battery light did not come on. Can anyone please help?

My car has 190000 miles.

Hello, thank you for writing in. The symptoms you are having are classic of a failing alternator. While the battery can be damaged and fail due to the vehicle relying solely on it for power while running, you will want to have both tested. The battery is used to help connect the charging circuit, but the alternator should be able to power the vehicle without the battery while the engine runs. Also make sure the battery cables and ground connections are all clean, dry, and tight. Luckily both should be able to be tested at your local parts store rather quickly, or at home with a voltmeter if equipped. If the replacement alternator was a re-manufactured or new part, then it should be under warranty if it was faulty. This happens but is not terribly common, so make sure you check the battery and connections before getting another replacement alternator. For more help with testing, contact our service department to schedule an appointment.

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. When my alternator went out, could it have killed my 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: Charging problem - 1999 Cadillac DeVille

First, you should check for injector pulse and fuel pressure. If either of these are not working, then there are some specific diagnostic paths to follow. If it is only spark you are missing, check all the fuses. Make...

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: Hi I have a 2007 nissan maxima 3.5l with a p0746 and a p0776 code saying the pressure control solenoid is stuck off

Hi Jeffery. The P-0746 OBD-II trouble code is one of the more confusing and hard to diagnose codes. P0746 will occur when the required amount of fluid pressure doesn’t match the actual amount that is detected by the vehicle’s PCM....

Related articles

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.
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.