Skip the auto shop - Our mechanics make house calls

Q: Car keeps dying even though I jump it and the battery is less than a year old

asked by on

car keeps dying. Less than year old battery. Give car a jump. Car starts and drives maybe a mile and dies while driving. Keeps repeating.

Hello. This is not caused by the battery most likely. The alternator may not be charging the battery and, after you jump start the battery, if the alternator is not recharging it, then the battery may be able to only keep the engine running for a few minutes before running out of power. You will need to have the battery completely recharged and load tested to make sure it is working properly even though it is only a year old.

Once the battery is recharged, then the alternator should be tested to see if it is charging normally. This is done with a battery/charging system tester or voltmeter with an amp probe. The alternator should be putting out about 13.5 volts and 80% of the rated amps output that it is rated at when the engine is running at 1500 RPMs. You should have an alternator rated at between 75 and 100 amps. This means if you are not getting over 60 amps output then the alternator needs to be replaced.

I recommend having a certified mechanic, such as one from YourMechanic, come to your location to determine why the battery will not hold a charge and replace the alternator if needed.

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
  • Home
  • Questions
  • Car keeps dying even though I jump it and the battery is less than a year old

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: I put a replacement steering column in with the right harnesses hooked up car wont turn on now the old one worked fine i just coul

It sounds like something was not connected properly or was put in the wrong place. Make sure the range selector is in the right place and not reading reverse or drive. If the range selector is not in park or...

Q: Difficult startup with a lot of idling when it's cold

One of the main things that can prevent a vehicle from starting in the cold is the battery. Batteries for automobiles are rated by cold cranking amps. This measurement is the amount of amperage the battery can produce at zero...

Q: Is my car toast?

having low compression in one or more cylinders with oil fouling of plugs will indicate a bad piston or piston rings. If the engine is more expensive to replace then the prive to repair and is over the value of...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.