Skip the auto shop - Our mechanics make house calls

Q: My car won't start anymore because the battery is dead.

asked by on

My car would not start so I called AAA And they charged the battery and also told me that something is draining the battery but don't know what it is. No lights were on or nothing. My battery is extremely old and I know I need to replace it. Also I wonder if my trunk had something to do with it because my trunk will close but it won't lock so when I drive and I hit a bump my trunk flaps up and down . What could it be that's really draining my battery?

My car has 146000 miles.
My car has an automatic transmission.

A: Hello, yes, something is draining your batt...

Hello, yes, something is draining your battery, and even a new battery won’t cure that. This problem can be diagnosed by connecting an ammeter to the positive (red) battery cable, observe the current drain, then, one at a time, remove each fuse, check to see if the current drain has dropped to near 0, then reinsert the fuse. This process should identify the faulty circuit in most cases.

A professional mechanic, like YourMechanic, can perform this procedure for you, and identify, replace/repair the failing component on that circuit. I would recommend having the dying battery inspected completed by a mobile, professional mechanic, such as one from YourMechanic, to diagnose this problem, get an accurate assessment of damage and cost estimate for repairs.

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: Car over heats

Hi there: The overheating issue may be caused by air bubbles trapped inside the cooling system. The fact that you're receiving that vacuum sound when you open the radiator cap indicates that you've got some air trapped in the system....

Q: Electrics issue in a relatively new car

Most of the electrical systems in your car are controlled by a module that controls power to the components when you want power. When you leave your vehicle and lock your doors it will stay active for a short time,...

Q: Low break fluid light is coming on, but I don't know how to check pads or for a leak.

Hi, thanks for writing in about your Chevrolet Impala. 40,000 miles is a decent amount of mileage for brake pads to wear out. The light sounds like it is coming on due to low brake fluid from the brake pads...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...