Skip the auto shop - Our mechanics make house calls

Q: Possible defective alternator

asked by on

We think our new alternator is defective.

A: Hello. The best thing to do would be to tes...

Hello. The best thing to do would be to test your battery and alternator to check to see whether your alternator is defective or if your having a battery issue. The battery starts your car, then the alternator takes over powering the car and charging the battery. If the alternator is bad the battery will not get charged and the Battery Light should come on. The battery and alternator check can be done by a certified technician, like one from YourMechanic. They will be able to diagnose your issue and replace your alternator if necessary.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: WHY DOES MY FUEL PUMP IN TANK LOOK DIFFERANT IT LOOKS LIKE ITS 2 PIECES. FOR A 2001 PATHFINDER

Hello, thank you for writing in. Under the rear seat where your stock jack and tire bar are located, there is a port to access and replace the fuel pump. You will have to pull back the carpet to find...

Q: My car died while driving it

In this case, it sounds like your battery or alternator is failing. If you'd like to get this fixed, certified technician, like one from YourMechanic, will be able to diagnose your stalling issue to determine the exact cause of your...

Q: Problems with the electrical system in the car

The accessories not functioning properly is most likely due to when the battery was disconnected. The systems may have lost any programing of the accessories and gone back to factory settings. I would recommend having the accessories reprogrammed as needed....

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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.