Skip the auto shop - Our mechanics make house calls

Q: battery won't stay charged.

asked by on

I put a new alternator and a new battery. The car starts but slowly dies and the battery hand goes up and down when I use the turn signal

My car has 286000 miles.
My car has an automatic transmission.

A: Hello. This is a common problem when there ...

Hello. This is a common problem when there is a bad ground connection or a faulty voltage regulator. The bad ground connection will cause the system to fail to complete the circuit which will not allow a full charge. The voltage regulator moderates the charging of the battery by the alternator. When this is not working properly, this will cause the alternator to either overcharge or undercharge the battery. I would recommend having an expert from YourMechanic come to your home to diagnose why your battery won’t hold a charge and repair the voltage regulator if necessary.

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

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: Code P0705 - 2008 Ford F-150

As with most diagnostic trouble codes, code P0705 does not necessarily identify failed parts. All you can assume with the code is that the PCM is not getting the signal it "expects" from the switch - no signal at all...

Q: How Can I Prevent My Car Battery From Dying?

The battery has a limited lifespan of between two and five years. A battery life can be shortened by lack of maintenance, leaving lights on and causing a discharge, charging system problems, or defective cables. A battery is made up...

Q: Dim dashboard lights..slower electrical functions

Hi there. In order to give you the best information I would need to know what kind of vehicle this is. From what you are explaining though it does sound like there is an issue with the electrical system. These...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.