Skip the auto shop - Our mechanics make house calls

Q: Why does my battery keep dying?

asked by on

My car battery went flat i charged the battery and it was fine after using it for a few days it went flat again, the battery only 12 months old iv had the battery and alternator test and they are both fine

My car has 90000 miles.
My car has a manual transmission.

A: This may be a sign of a failing voltage reg...

This may be a sign of a failing voltage regulator. As you 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. Often times when the voltage regulator is not working properly, this will result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely destroying the battery. I would recommend having an expert from YourMechanic come to your location to diagnose your vehicle’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

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: Delayed shifting

Hi There, You may be correct in that this may be a result of a faulty speed sensor, potentially low transmission fluid or a even a faulty transmission control solenoid. As your vehicle travels down the road, the computer analyzes...

Q: Unusual fuel drainage

The Volkswagen Golf has a fuel economy rated at 25 MPG City and 36 to 37 MPG Highway based on what transmission you have. These estimates are not void just because the engine has not broken. Since the vehicle is...

Q: Clutch making sound

There are a few different reasons for a clutch to make noise when being used. It is possible that the throwout bearing is causing the noise, but it is also possible that the clutch assembly is worn out, the pilot...

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...
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.