Skip the auto shop - Our mechanics make house calls

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 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

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: Won't start after being read with a Genesis Touch reader

I know these two things happened simultaneously but they may not be connected. Check your fuses for your fuel pump. It's turning over which is good, it just sounds like you aren't getting fuel. You could have a bad...

Q: Car won't start

Hi there! There first thing to check is your battery voltage. This can be done with a multi-meter. Simply place the red probe to the positive terminal and the black probe to the negative terminal, you should get at LEAST...

Q: my car makes a humming noise under the hood while I'm driving and parked. could it be a fuel pump issue or ignition problem?

A humming noise can be the engine electrical cooling fan. The fuel pump is in the rear of the vehicle so that is not as likely to be the cause. To pinpoint the fault, I would have a certified technician...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.