Battery Light Keeps Coming On And Off

2015 Volvo XC60 Low battery light keeps coming on. The battery was
2015 Volvo XC60 Low battery light keeps coming on. The battery was from

Battery Light Keeps Coming On and Off – Troubleshooting Guide


Having your battery light come on and off can be quite frustrating, especially when you’re not sure about the underlying issue. In this article, we will explore some common reasons why your battery light might be behaving this way and suggest potential solutions to help you troubleshoot the problem.

1. Loose or Corroded Battery Connections

One of the most common reasons for the battery light to come on and off is loose or corroded battery connections. Over time, the battery terminals can become dirty or loose, disrupting the flow of electricity. To fix this, start by turning off your vehicle, then carefully inspect the battery terminals. If you notice any corrosion or loose connections, clean the terminals with a mixture of baking soda and water and tighten them securely.

2. Faulty Alternator

Another possible culprit for the intermittent battery light is a faulty alternator. The alternator is responsible for charging the battery while the engine is running. If the alternator is not functioning properly, it may not be able to provide a consistent charge to the battery. To determine if the alternator is the issue, you can use a multimeter to check the voltage output. If the reading is significantly lower than the recommended level, it’s likely that the alternator needs to be replaced.

3. Failing Battery

A failing battery can also cause the battery light to come on and off. As a battery ages, it may not hold a charge as efficiently, leading to fluctuations in power. If your battery is more than three years old, it might be time for a replacement. Have your battery tested at a reputable auto shop to determine its health and consider replacing it if necessary.

4. Loose or Damaged Drive Belt

A loose or damaged drive belt can result in the battery light flickering on and off. The drive belt is responsible for transferring power from the engine to various components, including the alternator. If the belt is loose or damaged, it may not be able to spin the alternator effectively, causing irregular charging. Inspect the belt for signs of wear and tear, and if necessary, tighten or replace it.

5. Electrical System Issues

Problems within the electrical system of your vehicle can also trigger the battery light to come on and off. Issues such as a faulty voltage regulator or a short circuit can disrupt the charging process and cause the light to flicker. Diagnosing and resolving electrical system problems can be complex, so it’s recommended to consult a professional mechanic for accurate diagnosis and repair.


Experiencing a battery light that keeps coming on and off can be indicative of various underlying issues. From loose battery connections to a failing battery or a faulty alternator, there are several potential causes for this problem. By understanding these common causes and taking appropriate troubleshooting steps, you can address the issue and ensure the reliable performance of your vehicle’s electrical system.