Battery dash light comes on when starting car then disappears while driving

It sounds like the internal regulator is going out (or you might have lost one or more diodes) on the alternator. When you spin the engine higher (as in going down the road), the alternator has the ability to put out more current due to it spinning faster as well.

What does it mean when your battery light comes on and then goes off?

A loose or corroded battery cable. A problem with the alternator or voltage regulator. Damaged cells or plates inside the battery. Faulty wiring in the car’s electric charging system.

Why does my battery light came on when I start my car?

This is a bulb check function and is normal. Some lights may remain on while you turn the starter. But when the engine starts, the lights will go out as soon as the alternator starts producing sufficient charging voltage.

Why does battery light come on intermittently?

If the battery warning light turns of and off intermittently, most likely your alternator will fail soon. The alternator’s job is produce voltage and amperage to fill up the car’s battery and keep the vehicle running. The battery warning light will come on to alert you that the battery voltage is not correct.

How can you tell if its the battery or alternator?

If your car’s battery isn’t holding a charge, you have a problem with your alternator or battery. If your battery can start your vehicle but dies as the car runs, you have a faulty alternator. If your battery has been charged and can’t start your vehicle, it’s a battery issue.

Can a fuse cause battery light to come on?

The fuses may or may not cause problems with your vehicle’s battery charging system. There could, however, be a blown fuse between the battery and the alternator. This issue can cause the car’s battery light on.

How do I know if my alternator is bad?

7 Signs of a Failing Alternator

  1. Dim or Overly Bright Lights. …
  2. Dead Battery. …
  3. Slow or Malfunctioning Accessories. …
  4. Trouble Starting or Frequent Stalling. …
  5. Growling or Whining Noises. …
  6. Smell of Burning Rubber or Wires. …
  7. Battery Warning Light on Dash.

How do you check if your alternator is bad?

First, open the hood and start the car. While the engine is running, remove the negative cable from the battery. If the vehicle stalls or dies, the alternator is likely bad. This happens because the alternator is not generating enough electricity to keep the engine running on its own.

How do you check if your alternator is working?

A simple test to check the working of the alternator is by running your car; and then unplugging the positive connection of the battery. If the car stops, then you most likely have a problem with the alternator. Another simple test is to check your interior lights.

Can I drive with my battery light on?

It is unsafe to drive with your car battery light on. Issues that activate your car battery light, like a defective battery or faulty alternator, can cause your car to lose power. In these instances, your car won’t operate as it normally would.

How much does a new alternator cost?

You can expect to pay anywhere from $400 to $1,500 for a new car alternator in Australia. The exact price will depend on the vehicle you drive and whether you’re buying brand-new or used. The replacement will take at least 2 hours to install. Keep reading about what a car alternator does and when you should replace it.

Is it worth replacing an alternator?

It’s usually a better idea to replace the alternator entirely if it is malfunctioning. While new ones can be spendy, they are usually a better choice than remanufactured or rebuilt options. Those probably won’t last as long as a new one since the mechanical parts have miles on them already.

How long should an alternator last?

around 7-10 years

How Long Does an Alternator Last? An alternator should have a useful life of between 80,000 to 150,000 miles, or around 7-10 years, whichever comes first.