Why does the battery light come on when the alternator is on?
If the battery light is on when the voltage is above 13v then something is still wrong with the alternator as the switch for the light is in the alternator. I had this with a Denso alternator on a 2006 Ody. Installed new alternator and it worked great except after about 20 seconds the battery light came on even though charging voltage was 14.5v.
What happens if you have a bad alternator in your car?
But if you have a bad alternator, then it won’t be able to keep the battery charged. This will cause the car battery light to illuminate once there is an inconsistency in the charge. Once the alternator completely dies, the power that is left in the battery will be exhausted in a matter of minutes.
What to do if your car battery light comes on again?
Tip: Try starting your car in a safe location, if the battery light comes on again, do not drive it. Shut off the engine and open the hood to see whether the serpentine belt, alternator or battery have any problems that can be identified visually.
What causes a car battery light to illuminate while driving?
As you know, the alternator is responsible for keeping the battery fully charged as you are driving the vehicle. But if you have a bad alternator, then it won’t be able to keep the battery charged. This will cause the car battery light to illuminate once there is an inconsistency in the charge.
How do I know if my battery or alternator is bad?
Signs of a bad alternator. If the above steps reveal that the battery is working, it’s time to take a closer look at the alternator. There are certain signs of a bad alternator to look for: While running the car, note the brightness of the interior lights. If the dashboard gradually dims, the alternator is likely at fault.
Why does your battery light keep coming on?
There are a few different reasons why your vehicle’s battery light came on. It could be a problem with your alternator, which recharges your battery while your engine is running. It could also be a wiring issue such as a damaged or disconnected wire affecting your battery.
Why does the battery warning light stay on?
The warning light for the battery will stay on if a fault is detected in the charging system . If this occurs, there are a number of potential causes to check out when troubleshooting. Safety is important whenever working with electrical systems, so check your owner’s manual for general tips.
How do I know if it’s the battery or the alternator?
Check the Alternator. Test the alternator to make sure that it can start up the battery. If the battery is working properly and nothing is wrong with it, then it’s the alternator that will more likely cause a problem. Try to start the engine and listen carefully, if it produces a “whining” sound, it may be the alternator.