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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. 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 have an engine code on a 2009 Lincoln Town Car that indicates a bad thermostat sensor or thermostat. Is this time critical to ge

If the engine does not get to operating temperature in a certain amount of time the computer will set a code after two complete drive cycles doing the same thing. This is an indication that the thermostat is stuck partly...

Q: Q: Vehicle won't start

Hello. This is not a problem with the alternator or the starter. I have yet to see a bad starter on this vehicle. It is almost always the battery. The battery will need to be load tested to verify this....

Q: Tail lights suddenly not working.

You have a broken brake light switch connector wire. The green wire with a red stripe goes to the brake lights and will cause the brake lights not to work. You may also have a problem with the turn signal...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...