Skip the auto shop - Our mechanics make house calls

Q: Battery keeps getting drained

asked by on

My car has battery issues. It keeps getting drained and I don't know why. I went to the shop but they didn't find what is draining it. The car would occasionally not start. The alternator works fine. The battery is new. Do you have any idea what the cause might be?

A: If the battery is draining down over time, ...

If the battery is draining down over time, then there is a parasitic draw that is draining the battery. A parasitic draw test needs to be done on the vehicle and once set up, the fuses need to be removed one at a time until the draw disappears.

This will indicate the circuit that the draw is coming from. The conditions for the draw test have to be set so that vehicle enters its sleep mode and the fuses need to be accessible so they can be removed without waking the vehicle electronics. You may want to enlist the help of a mechanic, such as one from YourMechanic, who will have the necessary training and equipment to set up for the parasitic draw test and then execute the fuse removal without waking the vehicle electronics.

Was this answer helpful?
Recommended services
Get a Quote

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: wont start

It sounds to me like you could have an issue with your ignition switch. I would recommend having your ignition switch tested by a qualfied professional to determine if it is working properly. The ignition switch is what causes your...

Q: Not getting enough fire to turn over

Hello. If you suspect the ignition system's are to blame, you will want to start there. When was the last time you changed the spark plugs? Have the ignition cables or spark plug wires ever been replaced? You can test...

Q: Wont crank

If you tap the starter with a rubber mallet and then the starter works momentarily, the starter is probably defective and/or the electrical connections are loose. Confirm that the engine immobilizer system (security system) is not activated thus preventing the...

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 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...
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.