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: Removing the car battery from a 2012 S63 AMG

Hi there. There will be a bolt that is attached to a wedge that is holding the battery in place. The bolt will be next to the battery and the black box. You may have to remove the black box...

Q: My 67 mustang had issues starting so I changed the alternator and fuel pump. Now it won't start.

Hi there. Check all of the wiring form the charging system to the starting system. Make sure that all of the wires are tight and make sure that all of the cables have no green corrosion on them. Since you...

Q: Car shut off and back on, ESP light on

Not sure if the ESP system is related to stalling issue but the stability control system is reliant on several sensors for proper operation. It could be the brake light switch, which is a common failure along with the wheel...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.