Q: altinater is fine but battery light keeps coming on what could be the problem? came on 7 times while on the road

asked by on January 18, 2017

battery light continue to come on after altnator checked out ok same thing still occurs

My car has 234465 miles.
My car has an automatic transmission.

The battery should be load tested by a professional. Load testing can only be reliably performed on a fully charged battery. If the battery passes a load test be sure it is NOT a marginal pass in which case you should install a new battery to reduce diagnostic headaches as you seek a resolution to this. Batteries are a VERY important component in a car’s electrical system and the battery must be fully functioning to avoid electrical glitches. If the battery tests OK, you could have an intermittent fault in the charging circuit and that includes wiring, components, fuses, terminals, grounds, and so forth. Intermittent faults can be found using a data logger or, in your case, simply testing alternator output right at the moment the battery light comes on. An inadequately tensioned serpentine belt can also cause the issue you are reporting. If you desire that this problem be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a battery light diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
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

I have a 2006 Jeep Commander and sometimes when I go to start it there's nothing but a clicking noise? How can i find out why this

You will need to have the battery cables cleaned and serviced. Then have the battery tested for ability to hold a load. Replace the battery cable ends if they are broken or excessive corrosion along with replacing battery.

Gas tank's fuel pump stops pumping fuel randomly. Both fuel pumps are new, gas tank is clean, and a new fuel filters were installed.

Hello. The first thing to check when you have complete failure of the unit is the power supply. If the wiring going to the pump is loose or has a short somewhere, the power wont be delivered or will be...

thinking of buying a truck with 300K miles,well maintained etc. would it be a good idea?

The thing to look at is this is a full size truck with a small V6 engine size. This engine would have worked harder than a larger V8 engine would have. This does not mean the engine is bad but...

Related articles

The Best Used Cars to Buy If You Live in a Hilly Area
Do Do you live in terrain that is hilly? Do your city streets feature plenty of inclines and declines that can be nothing short of treacherous in miserable weather? If so, when it’s time to purchase a car you’re looking...
How the Alternator Works in Your Car
Your Your car alternator, at its most basic, is what works along with your battery and the rest of your charging system to keep your car running. When you start your car, you’re running on battery power. Then the battery...
Electric Cars and How They Work
Electric cars use an electric motor driven by a control unit. Their batteries are filled at charging stations and they produce no tailpipe emissions.