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: Q: Charging system warning light.

Hi There, This may be a sign of a weak battery, a failing voltage regulator or failing alternator. The alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while the engine...

Q: Near Constant squealing sound from drive side front wheel.

Hi there. The squealing noise that you are hearing from the wheel is the wheel bearings with no grease in them. I recommend replacing the wheel hub assembly on the driver side front wheel. If you need further assistance with...

Q: Alternator is not charging after being rebuilt

Hello, thanks for writing in. For an issue like this you should have a certified technician, like one from YourMechanic, come out and do a thorough starting and charging system check along with an evaluation of the the electrical system...

Related articles

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.
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.