Bmw F20 Battery Not Charging – 8 Solutions To Try

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Written By John Paul

John Paul is a tech enthusiast dedicated to troubleshooting. He is passionate about fixing glitches, simplifying complexities, and empowering others in the digital realm.

Experiencing a BMW F20 battery not charging issue can be a source of frustration and concern for any BMW owner.

The battery and charging system are vital components that ensure the proper functioning of your vehicle. When your battery fails to charge, it can leave you stranded and disrupt your daily routine.

But worry not we are here to help you!

In this guide, we will provide you with step-by-step instructions to address the BMW F20 battery not charging issue.


4 Common Symptoms of BMW F20 Battery Not Charging

When encountering issues with a BMW F20 battery not charging, it is crucial to first identify and understand the symptoms before taking any action.

This step is vital because various factors can contribute to a battery not charging properly, and the symptoms can help pinpoint the underlying problem.

No. Symptoms Description
1 Battery warning light on the dashboard The battery warning light illuminates on the dashboard, indicating a problem with the charging system and a potential lack of power reaching the battery.
2 Difficulty starting or failure to start The car may take longer than usual to start or may not start at all, indicating insufficient power from the battery due to charging issues.
3 Dimming headlights Headlights may appear dimmer than normal, indicating a potential lack of power reaching the headlights due to problems with the alternator or wiring.
4 Malfunctioning electrical components Issues may arise with various electrical components, such as radio, air conditioning, power windows, and locks, indicating inadequate power supply to operate these systems properly.

Troubleshooting BMW F20 Battery Not Charging – 8 Steps 

With some basic troubleshooting steps, you can potentially identify and resolve the BMW F20 battery not charging issue. Let’s find out what these troubleshooting steps are.

BMW F20 Battery Not Charging 8 Fixes - Infographic

Read More: BMW F10 Battery Not Charging – 5 Practical Solutions

1. Checking the Fuse Box

The first and crucial step in troubleshooting a BMW F20 not charging issue is often overlooked, but it can significantly impact the diagnosis and resolution.

This step involves checking the fuse box, which houses the fuses and relays responsible for the proper functioning of the charging system.

Many charging-related issues can be traced back to a blown or faulty fuse, disrupting the flow of electricity and preventing the battery from charging effectively.

To check if a faulty fuse is causing your battery not to charge

  • Remove the cover of the fuse box to access the fuses.
  • Inspect each fuse visually to identify any blown or damaged fuses.
  • If you find a faulty fuse, replace it with a new one with the same amperage rating.
  • If all fuses appear intact, consider checking other components of the electrical system, such as the alternator or battery cables.

A Fuse Box of BMW F20


2. Checking the Battery Connections

Now it’s time to take a closer look at the battery connections and make sure everything is secure and snug. It’s important to note that poor battery connections can be one of the main reasons why your BMW F20 is not charging properly.

To check the battery connections:

  • Open the hood: Begin by opening the hood of your BMW F20 to access the battery.
  • Inspect terminals: Check both the positive and negative terminals of the battery for any signs of corrosion or damage.
  • Clean terminals: If you notice any buildup on the terminals, use a wire brush to gently clean them off.
  • Examine cables: Inspect the battery cables for any fraying or damage that may affect the electrical connection.
  • Tighten connections: If you find any loose connections, use a wrench or pliers to tighten them securely.
  • Ensure firm connection: Make sure that both the positive and negative cables are firmly connected to their respective terminals.
  • Close the hood: Once you have completed these steps, close the hood of your BMW F20

3. Cleaning the Battery Terminals

After checking the battery connections, If you find the terminals corroded, address this issue promptly as corrosion indicates a chemical reaction between the battery’s acid and the surrounding environment.

This reaction can lead to the formation of a corrosive substance, which hinders the flow of electricity and affects the battery’s charging performance.

Don’t worry, though – cleaning the terminals is a relatively simple fix that you can do yourself.

Follow the steps below to clean the terminals of your battery!

Step Procedure Description
1 Disconnect the battery Start by removing the negative terminal (black) first, followed by the positive terminal (red).
2 Prepare the mixture Create a mixture of baking soda and water.
3 Apply the mixture Use a brush or cloth to apply the baking soda and water mixture to the battery terminals.
4 Scrub gently Scrub the terminals gently to remove any corrosion or dirt buildup. Be careful not to damage the terminals.
5 Rinse with water Rinse the terminals with clean water to remove the baking soda mixture.
6 Dry thoroughly Ensure the terminals are completely dry before reconnecting them.
7 Reconnect the terminals Start by reconnecting the positive terminal, followed by the negative terminal. Ensure they are securely attached.

cleaning car battery terminals with brush


Also Read: BMW F30 Battery Not Charging – 7 Solutions To Try

4. Testing the Battery Voltage

After cleaning the terminals, the next step in troubleshooting a BMW F20 battery not charging is to test the battery voltage.

This test will provide valuable information about the battery’s current state and help determine if it requires charging or replacement. To test the battery voltage, you will need a multimeter.

Here is a step-by-step process for testing the battery voltage:

  • Set your multimeter to the DC voltage setting and ensure it is within the appropriate range to measure the battery voltage.
  • Turn off all electrical components in the car, including lights, radio, and air conditioning, to minimize any additional power draw.
  • Connect the multimeter’s positive (+) lead to the positive terminal of the battery and the negative (-) lead to the negative terminal.
  • Make sure the leads have a solid connection with the terminals.
  • Read the voltage displayed on the multimeter. A fully charged battery should ideally have a voltage reading of around 12.6 volts or slightly higher.
  • If the battery voltage is significantly lower than the expected range, it may require charging.
  • if the voltage is within the expected range but the battery still fails to charge properly, further investigation into other potential causes is needed.

5. Replacing the Battery 

After conducting the necessary testing, if you determine that your BMW F10 requires a battery replacement, you can follow the steps below:

  1. Turn off the engine and engage the parking brake.
  2. Remove the trunk floor cover to access the battery compartment.
  3. Refer to the vehicle’s manual or online resources to locate the battery.
  4. Disconnect the negative terminal (-) using a wrench or socket.
  5. Disconnect the positive terminal (+) using a wrench or socket.
  6. Remove any retaining brackets or straps securing the battery.
  7. Lift the old battery out of the compartment, being careful not to tip or spill.
  8. Position the new battery in the compartment and secure it with brackets or straps.
  9. Connect the positive terminal (+) and tighten the terminal nut securely.
  10. Connect the negative terminal (-) and tighten the terminal nut securely.
  11. Test the new battery by starting the engine and checking for any issues.

6. Testing the Alternator

The alternator plays a crucial role in charging your car’s battery while the engine is running. If it fails, your battery won’t charge and eventually die, leaving you with a dead car.

To test if your alternator is working properly, follow these simple steps:

  1. Start your car and let it idle for a few minutes.
  2. Turn on all electrical components, such as headlights, radio, air conditioning, etc.
  3. Use a voltmeter to measure the voltage at the battery terminals.
  4. A healthy alternator should produce a voltage between 13-14 volts while running all electrical components.

If the voltage reading falls below this range, then there might be an issue with your alternator. However, before replacing it entirely, make sure to check all cables and connections for any signs of damage or wear and tear.

Read More: BMW F10 Alternator Not Charging – 6 Quick Troubleshooting Steps

7. Replacing the Alternator

Follow the steps below to replace the alternator to resolve the charging issue:

  1. Ensure the engine is off and engage the parking brake.
  2. Open the hood and locate the alternator at the front of the engine.
  3. Disconnect the negative battery cable using a wrench or socket.
  4. Disconnect the wiring harness from the alternator.
  5. Loosen the bolts or adjust the bracket securing the alternator.
  6. Remove the old alternator from its mounting position.
  7. Position the new alternator in the mounting location.
  8. Secure the new alternator with bolts or adjusting brackets.
  9. Reconnect the wiring harness and electrical connectors.
  10. Reconnect the negative battery cable and tighten the terminal nut.
  11. Close the hood and start the engine to test the new alternator.

8. Seeking Professional Help

If you’ve exhausted all your troubleshooting attempts and your BMW F20 is still not charging then it’s clear that it’s time to seek professional help.

Sometimes, car issues can be more complex than they initially appear, and attempting to fix them without the necessary expertise can be challenging and potentially lead to further complications.

By reaching out to a certified BMW technician, you are taking a proactive step toward resolving the battery charging problem efficiently and effectively.

These professionals have the necessary knowledge, experience, and specialized tools to accurately diagnose and repair the issue.

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Preventative Maintenance – Tips for Avoiding Future Issues

To prevent future problems with your vehicle’s electrical system, it’s important to regularly maintain and inspect the components that contribute to its functionality.

Preventative Measures Description
1. Clean battery terminals Regularly clean the battery terminals using a mixture of baking soda and water, followed by a thorough rinse with clean water.
2. Check the alternator belt Inspect the alternator belt for signs of wear and tear. Replace it if necessary, as a broken or loose belt can affect battery charging.
3. Drive the car regularly Avoid leaving the car unused for extended periods, as it can lead to battery drain.
4. Use a battery charger/maintainer Consider using a battery charger/maintainer if the car is frequently left unused or driven only for short distances.

By taking these simple steps, you can avoid future issues with charging your BMW F20’s battery and potentially save yourself time and money down the road.


Why is my BMW F20 battery not charging?

The BMW F20 battery may not be charging due to several reasons, including a faulty alternator, a weak battery, loose or corroded battery connections, or electrical system issues.

What are the common causes of the BMW F20 battery not charging?

Some common causes of the BMW F20 battery not charging are a worn-out battery, a malfunctioning alternator, a faulty voltage regulator, loose or corroded battery connections, or a faulty charging system.

How can I check if my BMW F20 battery is not charging?

You can check if your BMW F20 battery is not charging by using a voltmeter to measure the battery voltage.

A fully charged battery should have a voltage of around 12.6 volts. If the voltage is significantly lower, it indicates a charging problem.

What should I do if my BMW F20 battery is not charging?

If your BMW F20 battery is not charging, you can try several troubleshooting steps. First, check the battery connections for looseness or corrosion and clean them if necessary.

Ensure that the alternator belt is properly tensioned. If these steps don’t resolve the issue, it’s recommended to have a professional diagnose and repair the charging system.

Can I jump-start my BMW F20 if the battery is not charging?

Yes, you can jump-start your BMW F20 if the battery is not charging. However, keep in mind that jump-starting is a temporary solution and should only be used to get your vehicle started.

It’s important to address the underlying charging issue and have the battery and charging system inspected by a professional.

Should I replace the battery if my BMW F20 is not charging?

If your BMW F20 battery is not charging and it’s old or has been previously replaced, it may be a good idea to consider replacing the battery.

A worn-out battery can cause charging problems, and replacing it can help resolve the issue. Consult with a professional to determine if a battery replacement is necessary.

How often should I check my BMW F20 battery for charging issues?

It is recommended to check your BMW F20 battery for charging issues regularly, especially before long trips or during extreme weather conditions.

Additionally, perform routine maintenance and inspections according to your vehicle’s maintenance schedule to prevent charging problems.

Can a faulty alternator cause the BMW F20 battery not to charge?

Yes, a faulty alternator can cause the BMW F20 battery not to charge. The alternator is responsible for charging the battery while the engine is running.

If the alternator is not functioning properly, it may not supply sufficient power to charge the battery.

Is it safe to drive my BMW F20 with a battery not charging?

It is not recommended to drive your BMW F20 with a battery that is not charging. A discharged or weak battery can lead to sudden loss of power, making it unsafe to operate the vehicle.

Addressing the charging issue before driving is best to avoid any potential problems.

Where can I find professional assistance to fix my BMW F20 battery charging issue?

You can find professional assistance to fix your BMW F20 battery charging issue at authorized BMW service centers or reputable auto repair shops.

These professionals have the expertise and specialized tools to diagnose and repair charging system problems in your BMW F20.

Official References & Resources

Our research for accurate information about BMW involved a thorough analysis of official resources, including the official BMW website owner’s manuals, technical specifications, and relevant support forums.

Our research and data gathering involved thorough analysis of the official websites, including:

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