Q: Something is draining my battery, both battery and alternator have been checked and are working fine.

asked by on

I am having to jumpstart my vehicle. Once it is jumpstart, it runs fine with no issues but if I leave the car sitting for about 7 hours or longer I have to jumpstart it again. The battery and alternator both have been checked and are working fine. It appears that something is draining the battery after the vehicle sits for a while. I thinking a short in maybe the battery cables or a ground problem.

My car has 10900 miles.
My car has an automatic transmission.

Hi. Your diagnosis is spot on! If the alternator and battery are good, something is causing a pretty significant drain on the battery, and this needs to be identified. This problem can be diagnosed by connecting an ammeter to the positive (red) battery cable, observe the current drain (likely less than 1 amp), 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 one from YourMechanic, can perform and electrical inspection for you, and replace/repair the failing component as needed.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Something is draining my battery, both battery and alternator have been checked and are working fine.

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: It has a rattling sound and once in a while it jerks and i have low oil level?

The rattling sound can depend on where the sound is coming from. This can be loose muffler mounts if coming from underneath the car or other loose engine component mounts if coming from under the hood or potentially loose suspension...

Q: I've Mercedes ml350 and I was driving g under heavy rain the next day my signal lights, wiper blades, power seat stop working

Hello, thank you for writing in. The passenger (right) side of the vehicle (on yours and a lot of other vehicles) holds a computer system behind the fender (just under the floorboard). This is the box that controls the power...

Q: Acceleration problems in 2004 Toyota Solara

Your particular vehicle has an electronic throttle body that drives by wire, rather than a mechanical cable. The electronic throttle body relies on signals from the accelerator pedal to know how much to open or close the throttle plate. A...

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...
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.