Q: New battery goes dead overnight

asked by on

I recently got a new alternator replaced in my vehicle, but every time I drive it and park it the next day I go out the car is completely dead. Before the alternator was fixed I replaced the battery. Could have that bad alternator affected that battery and I need to replace it with a new one?

My car has 54000 miles.
My car has an automatic transmission.

If you have a new battery, you should be able to drive for a few hours and be able to restart the car a couple of dozen times even if the alternator is not working. So I suspect you have an electrical drain that is staying on when the car is shut off. It could be as simple as an interior door light that doesn’t go off, but it’s probably more complicated than that. Modern cars are always drawing on the battery when the car is off, just a few miliamps. It’s not enough to drain the battery overnight, but it can drain the battery if you don’t drive the car for a few weeks or more. If something has gone wrong, and the car has a significant drain, it can go down overnight. Finding that drain requires a technician who is familiar with the systems on your car. Contact YourMechanic to have a technician come out to your home or office to check out your Caravan and let you know why the battery is going dead.

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. New battery goes dead overnight

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: special battery?

Hello there, thank you for asking about your 2014 Hyundai Elantra. Car batteries are generic, except the very sophisticated battery packs used in electric or hybrid electric vehicles. In terms of physical size, capacity, and terminal type and position though,...

Q: Not heating very good

Hello, thank you for writing in. There are two separate issues at hand here. The first is the leak. Check the level of coolant in your radiator (when you open the cap it should be full), and in the reservoir....

Q: Battery Light illuminated

The Battery Light on the dashboard typically indicates an issue concerning the vehicle's charging system. This usually points to an alternator that cannot maintain the charge of the battery. The alternator is on a fused circuit, and fuses should be...

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...
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.
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.