Skip the auto shop - Our mechanics make house calls

Q: Charning issues, new battery and alternator

asked by on

I've recently had the battery and alternator replaced with new ones on my car. Despite that, it seems to have some problems with charging. The voltmeter would go into the red zone each time I had the headlights turned on along with the wipers and the heat. The charging is normal when everything is turned off. Why is this happening?

Hello there. There are a few potential causes for why the car would have charging faults even after the alternator is replaced. The most common would be the battery cable, shorted harness, battery, or a failed alternator. The first thing a technician will do is to check for charging voltage and the alternator output. If the alternator output is below spec. It would be bench tested to rule it out as the fault before any more diagnosis is performed. A qualified technician, such as one from YourMechanic, will be able to perform a diagnosis on the charging issue and let you know what repairs or adjustments are needed.

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: Hit deer; car damaged

It seems like there has been extensive damage that has taken much of the safety away from this vehicle. I would recommend consulting the services of a collision center. The twisted metal and broken parts will cause wear on the...

Q: After 10-15 minutes the headlight (both hi and low) will cut off and on.

Hello - your "on again, off again" headlight symptoms indicate an electrical connection that is poor, that heats up while the headlights are operating, then fails. This could be a headlight relay, the headlight switch itself, or a wiring connection...

Q: Van is choking and stalling

If fuel is not getting to the carburetor, then you have one of a few different problems. The most common would be the fuel filter being clogged. Depending on your engine you may have one or more fuel filters both...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...