Why does my car battery light not go off?

Why does my car battery light not go off?

I checked the battery and it’s reading 12.8v with the engine off, and 13.8 with the engine on. Another time I tested it it showed 14v while running and the battery light was not on. I also did a diode test as per Paulster’s comment, and it showed 1 in one direction and -1199 in the other direction, which seems within spec.

When does the battery warning light go out?

The airbag computer will set a code and turn on the warning light when the system voltage is too high, or too low. The light should go out when the problem is repaired. It may not go out immediately though. You need to have your alternator checked. Right now, all of the electrical devices on your car are drawing from the battery.

What causes a battery light to come on after an alternator is installed?

The most common is, again, a loose connection either with the control plug (aka “relay” plug-in), charging line connection, or the ground. The other is a blown fuse or defective connector or relay, which could have been broken or shorted when the alternator was installed or on the first start-up after its installation.

What’s the battery light on a Mazda 626?

I just changed the battery on my 98 Mazda 626 and now the battery light comes on and stays on after starting the car. I checked the battery and it’s reading 12.8v with the engine off, and 13.8 with the engine on. Another time I tested it it showed 14v while running and the battery light was not on.

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 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 is my car battery light blinking?

A fault with the alternator is probably the main reason for a battery light to flicker. It means your battery has taken over to keep the electronics working. As soon as the output from the alternator drops to a certain fairly low level, the battery light flickers.