Skip the auto shop - Our mechanics make house calls

Q: if you jump start a car and it shuts off as soon as you take off the cables is the alternator bad

asked by on

same as the question
My car has an automatic transmission.

Hello. Yes, a car that shuts off as soon as the cables, or power source are removed can indeed be an indicator of a bad alternator. I would remove and test the alternator before replacing it just to be sure. If you need help with this, feel free to reach out to a certified mechanic who can test your alternator and diagnose your dead battery symptoms in order to get your car running again.

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!
  1. Home
  2. Questions
  3. if you jump start a car and it shuts off as soon as you take off the cables is the alternator bad

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: Tires are turned in vibrate when started stops while driving

Hello there. The most common causes of a tire vibration are the inflation levels, tire balance, damaged wheel or tire or an alignment issue. With your car only having 1 mile on it, I would suspect that the tire...

Q: Why is my car idling high

This may be related to a faulty idle air control valve or possibly a throttle stop that may need to be adjusted. The idle air control valve monitors the air intake as it is mixed with fuel prior to being...

Q: Brain rattling shaking when accelerating a little harder like up hill but not when cruising normally & car starts/idles fine

Hi There, Engine mounts can certainly cause a vibration when accelerating and may also cause a slight vibration at other times as well depending on the severity of their condition and where they may be damaged. Engine mounts are generally...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...