Skip the auto shop - Our mechanics make house calls

Q: Changed alternator and battery, but still says check charging system

asked by on

Changed my battery a few weeks ago when my car died. Check charging system came back up. AutoZone said it was the alternator. I changed that also. Now two weeks later the message is back. What is it?

My car has 61000 miles.
My car has a manual transmission.

A: Hello and thank you for writing in! This i...

Hello and thank you for writing in!

This is likely a sign of a bad voltage regulator. This is a unit that regulates the charging of the battery from the alternator. When this is not functioning properly, this can cause the battery to be over or undercharged by the alternator and will cause this light to come on. I would recommend having an expert from YourMechanic come to your home to diagnose and service your car’s 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!

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: Alarm

You should first make sure you are using a good code key and if you have a second key then try it first before continuing. The key should turn the key to the on position to see if the theft...

Q: My 2000 caddilac wont shift to other gears

Hi there. In most cases, when an automatic transmission has difficulty shifting gears, it's due to a restriction of transmission fluid within the hydraulic lines of the transmission. It can also be caused due to a shift sensor or damaged...

Q: Not sure why car won't start.

Hello, Unfortunately without more information, I will be unable to pinpoint why your Dodge Stratus is not starting. The first step I recommend for all car drivers however is to check your car’s battery. You can do this by turning...

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...
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.