Q: installed new alternator and battery the alternator is charging the battery and the battery is maintaining afull charge but the ba

asked by on

battery light came on ,so I assumed it was the alternator or battery, both were original so I replaced both, I checked them both and the battery is now maintaining a full charge but the battery light wont go off

My car has 101000 miles.
My car has an automatic transmission.

Hello. If the battery and the alternator are new and if it is verified that the alternator is charging then you have an issue with programming. When you replace the battery on this vehicle the computer needs to be reprogrammed to recognize it and to properly charge it. If this is not done then the computer will not turn on the alternator at the correct times an this battery light will come on. You need to have this programming done by a certified mechanic, like one from YourMechanic, who can come to you to [program the battery into the computer] https://www.yourmechanic.com/services/battery-light-is-on-inspection

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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 new alternator and battery the alternator is charging the battery and the battery is maintaining afull charge but the ba

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: Car won't turn over

Hello, when a vehicle doesn't start,there are two things to check, the base engine and the electrical circuits to the starter motor. The base engine is easy to check, by seeing if the crank rotates with a ratchet and socket...

Q: Hi, I have a 2003 bmw X5 3.0i petrol. 2 problems. 1. abs trifecta lights on, when i plug in my own (cheap) diagnostic tool it onl

Hello and thank you for contacting YourMechanic. The code for your BMW P1619 is referring to the thermostat sensor. Check the thermostat sensor harness for an debris, looseness, and corrosion. If the sensor looks good, then the thermostat needs replaced...

Q: Stalls when driving, at turns and at stops ?

Hi there. The most likely cause for the engine stalling is, a dirty/faulty IAC (idle air control) valve. Assuming, the check engine light is not coming on, leads me to believe the PCM (powertrain control module)/computer is not recognizing the...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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.