Skip the auto shop - Our mechanics make house calls

Q: Installed a new battery and the battery light is still on

asked by on

I recently installed a new battery in my car and I drove it but the battery light came on and then today it stopped on me again.
My car has an automatic transmission.

This may be a sign of a failing alternator or voltage regulator. As you may know, the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while the engine turns the alternator. The voltage regulator is a unit that regulates the charging of the battery by the alternator and maintaining a certain amperage while the engine runs. When the alternator is not working properly, this may result in the battery quickly losing charge causing the battery light to come on as you have indicated. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your charging system.

Was this answer helpful?

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!
  1. Home
  2. Questions
  3. Installed a new battery and the battery light is still on

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: Thermostat replacement on a 2002 Ford Escort

Yes, if you don't have any problems. If the thermostat has a problem, it will shut. If it shuts, then your temperature gauge will get behind and you'll have to change it; or it will stick right open and your...

Q: 01 Elantra won't start each time I have to play around with the tubes on the fuel pump also unplug and plug it back then it starts

The problem sounds like you have a connector to the pump is losing connection to the pump. Check the connector for signs of getting hot and replace connector to the pump.

Q: Truck has began stalling from the air filter. Recently replaced it an hour ago and seems to still stall at 2600rpm

You should have the engine scanned to see if the mass airflow sensor (MAF) was damaged from the water or debris from the air filter. The MAF has a hot and cold internal sensor and can get damaged from excessive...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...