Skip the auto shop - Our mechanics make house calls

Q: I just had the alternator replaced, but my car cuts off while driving.

asked by on

I just had the alternator replaced, but my car cuts off while driving.

A: If your vehicle is losing battery voltage (...

If your vehicle is losing battery voltage (i.e. your battery light is on) the problem may be your battery. You have a new alternator, so if your battery is bad, it won’t hold the charge from the alternator. The problem could still be a defective alternator or improper installation. A fuse could also be the cause. If you still have power (headlights still work) the problem is in the fuel or ignition system. Your vehicle has a very complex ignition system and should only be serviced by trained professionals. Have a mechanic inspect your vehicle and diagnose your problem for you.

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: 235$ for puller replacement?

Hi there. It really depends on what pulley you are referring to that will determine whether or not it's a good deal. For example, a water pump pulley would be rather simple to replace, without too many hours of labor...

Q: My 2009 Nissan Altima won't start. I press the brakes and and push the start button and the inside of the car comes on.

Hi there: Although it's possible that a faulty brake switch is the reason why your Altima won't start, it's also possible that the starter, starter relay, ignition relay or ignition module on your 2009 Nissan is damaged or faulty. The...

Q: Shut down while driving

Hello, thank you for writing in. It certainly sounds like the vehicle is losing electrical power, which is an almost definite sign that the alternator has failed. It is solely responsible for providing electrical power to the vehicle while driving....

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 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...
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.