Skip the auto shop - Our mechanics make house calls

Q: Something draining the battery

asked by on

The battery in my car is dead. I jumped it and ran it for 30 minutes. Usually it restarts after charging for that long. Don't know if the alternator or battery, or both, are bad. Something is draining the battery.

A: If it ran for 30 minutes after a jump, the ...

If it ran for 30 minutes after a jump, the alternator is probably ok. I would start by checking the battery first. Alternators are not designed to charge a dead battery. A good battery, that is completely dead, takes more than 4 hours to charge on a 20 amp charger. I would have the alternator tested after the battery is replaced. If you would like this repaired, consider having a qualified mechanic, such as one from YourMechanic, come and test why your car is having issues starting.

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・Save up to 30%

Get a quote

What others are asking

Q: Car overheating; fans not working

Hi there. Many components make up your cooling system. If any of these components are not functioning properly it will cause your vehicle to overheat. If your vehicle is not leaking any coolant chances are that your radiator fan(s) are...

Q: Will alternator or starter make car .it started this when i turn my ac on

If the alternator has failed, the vehicle will run until the battery dies as the alternator is responsible for maintaining the charge on the alternator. The battery light illuminating on the dashboard is usually the tell tale sign that the...

Q: Going through too many batteries

If you have replaced your battery four times since 2012 then you are having an issue with your charging system that should be diagnosed. There are a few Technical Service Bulletins(TSB) that could address your issue. The first two are...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...