Skip the auto shop - Our mechanics make house calls

Q: I went out of town and trunk wasn't shut, so battery was dead and had to jump it.

asked by on

Trunk wasn't shut for 4 days and the car was completely dead. Jumped it very easily and ran errands for a couple hours without turning it off. Then I turned it off and went to start it 30 minutes later and it wouldn't start. Lights came on but didn't turn over. Jumped it again and drove it to O'Reilly's to test battery. They said couldn't get a reading on battery so it meant alternator was draining it because alternator was going out. Drove it home and turned it off and then restarted fine. Do you think alternator is going out?

My car has 50000 miles.
My car has an automatic transmission.

A: Hello, thanks for writing in. If the vehi...

Hello, thanks for writing in.

If the vehicle started back up then it is not likely that the alternator is bad. If the alternator was bad, the battery would have been low and you would not have been able to restart the vehicle later on. It may be possible that after driving it around for an entire day, the battery is now charged enough to properly start the vehicle again. However, if the issues persist, I recommend having the battery and alternator tested by another place.

If you would like inspection help, consider having an expert automotive technician from YourMechanic come to your home or office to diagnose this issue for you and make any repairs as 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

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: timing belt and tensioner replacement

Hello. All noises have to be diagnosed and confirmed so that you don't needlessly spend money on repairs. In your circumstance, your particular car model does require a new timing belt every 60,000 miles anyway, so if the timing belt...

Q: Why do I constantly need to replace the brake rotors and brake pads?

Hi there. That's a really good question. What reason were you given that the rotors need replacing? What symptoms are you experiencing? If you have a brake vibration, the rotors should have enough thickness after a year, unless you drive...

Q: My car jerks when put on reverse and speed drop atimes when I accelerate

What you are describing may be a result of a faulty speed sensor, potentially low transmission fluid or a even a faulty transmission control solenoid. As your vehicle travels down the road, the computer analyzes data being sent by vehicle...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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.