Battery light comes on after starting the car. How big of a problem is this?

The battery light comes on when you start your car, and it might linger for a second or two, but it usually turns off pretty quickly. If it stays on while the car is running, it probably means there’s something wrong with the alternator. It could also mean there is a minor problem with the battery like corrosion.

Why does my battery light come 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.

How can you tell if its the battery or alternator?

If the engine starts but dies immediately, your alternator probably isn’t keeping your battery charged. If a jump starts and keeps your car running, but the car can’t start again off of its own power, a dead battery is probably your answer.

Why does battery light come on and off?

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It recharges the battery. And provides electricity to accessories while the engine is running. So if the battery light is on it means the alternator isn't generating any electricity to charge the

Can a fuse cause battery light to come on?

Observe the fuse



The fuses might not cause any direct issues with your vehicle’s battery charging operation. However, there could be a blown fuse somewhere linking the battery and the alternator. This problem can turn on the battery light in the car.

What are signs your alternator is going out?

If your alternator is failing, its voltage may drop below capacity, causing the battery warning light to appear on your dash. Similarly, the battery light will also appear if the alternator is exceeding its voltage limit, depending on how much stress it is under.

How do I check my car alternator?

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  1. Get a multimeter.
  2. Set your multimeter to DCV (DC Volts) above 15.
  3. Make sure your alternator’s positive and negative terminals are clean.
  4. Put the multimeter’s black cable to the negative terminal and the red cable to the positive terminal.
  5. Look for an ideal alternator reading of around 12.6.

What are the signs of a bad battery?

Watch for these five telltale signs of a bad battery so you aren’t caught out in the cold!

  • Dim headlights. …
  • Clicking sound when you turn the key. …
  • Slow crank. …
  • Needing to press on the gas pedal to start. …
  • Backfiring.