The E38 is a model designation for the BMW 7 Series, which was produced from 1994 to 2001. It was the third generation of the BMW 7 Series and was available in a range of different models, including the 728i, 730i, 735i, 740i, 740iL, 750i, and 750iL.

The E38 was known for its advanced technology and luxurious features, such as its adaptive cruise control, electronic stability control, and navigation system. It was also known for its smooth ride and powerful engines, which ranged from a 2.8-liter inline six-cylinder to a 5.4-liter V12.

Overall, the E38 BMW 7 Series is considered a classic luxury sedan, with many still in use and highly prized by collectors and enthusiasts.

Are you having trouble with your E38 BMW’s battery not recharging? A car battery that won’t charge is a frustrating issue that can leave you stranded in the middle of nowhere. However, before you take your car to the mechanic and spend a fortune, it is important to troubleshoot the problem and attempt to fix it yourself. This article provides a comprehensive guide on how to check the E38 BMW battery if it can’t recharge.

1. Check the Battery Age and Condition

The first step is to determine the battery’s age and condition. Batteries typically last between three to five years, but environmental factors and usage can shorten its lifespan. You can check the manufacturing date on the battery label, which will help you determine its age. If it is over five years old, it is likely that it needs to be replaced.

2. Inspect the Battery Cables and Terminals

Battery cables and terminals can corrode over time, resulting in a weak or dead battery. Inspect the cables and terminals for any signs of corrosion, rust, or loose connections. If you see any corrosion or rust, clean it off with a wire brush and apply dielectric grease to prevent future corrosion.

3. Test the Battery Voltage

Use a voltmeter to check the battery voltage. The voltage should read between 12.4 and 12.7 volts when the car is off. If it reads lower than 12 volts, the battery may be discharged and needs to be recharged. If it reads higher than 12.7 volts, the battery may be overcharged, and the alternator needs to be checked.

4. Check the Alternator

The alternator charges the battery while the car is running. If the alternator is not functioning correctly, the battery won’t recharge. To check the alternator, start the car and test the voltage at the battery terminals. The voltage should read between 13.5 and 14.5 volts. If it reads lower, the alternator may not be charging the battery, and it needs to be replaced.

5. Check the Battery Cells

Battery cells can fail, resulting in a dead battery. Use a hydrometer to test each cell’s specific gravity, which should read between 1.225 to 1.300. If it reads lower, the cell is weak or dead, and the battery needs to be replaced.

6. Inspect the Battery Tray

The battery tray can corrode over time, which can cause the battery to move and damage the cables and terminals. Inspect the battery tray for any signs of corrosion, rust, or damage. If you see any, clean it off and apply a rust inhibitor to prevent future corrosion.

7. Check the Battery Charger

If none of the above steps work, the battery charger may be faulty. Test the battery charger with a voltmeter to ensure it is functioning correctly. If it is not, it needs to be replaced.

8. Consider Replacing the Battery

If you have tried all of the above steps and the battery still won’t recharge, it may be time to replace it. Ensure that you purchase the correct battery for your E38 BMW and follow the installation instructions carefully.

By following these steps, you can troubleshoot and fix battery recharge issues in your E38 BMW. Regular maintenance and inspections can help prevent battery problems in the future.

Top questions

  1. What causes a BMW battery to not recharge? There are several reasons why a BMW battery may not recharge, including age, corrosion, weak cells, a faulty alternator, or a malfunctioning battery charger.
  2. Can I recharge a dead BMW battery? Yes, you can recharge a dead BMW battery using a battery charger or by jump-starting the car.
  3. How long does it take to recharge a BMW battery? The time it takes to recharge a BMW battery depends on the charger’s amperage and the battery’s condition. It can take anywhere from a few hours to overnight to recharge a dead battery fully.
  4. How much does it cost to replace a BMW battery? The cost of replacing a BMW battery depends on the make and model of your car, as well as the battery’s size and type. Expect to pay between $150 to $400 for a replacement battery.
  5. Can I replace the BMW battery myself? Replacing a BMW battery is a straightforward process that you can do yourself if you have the right tools and knowledge. However, if you are unsure, it is recommended to seek professional help.

Battery recharge issues can be a frustrating problem for E38 BMW owners. However, by following the steps outlined in this article, you can troubleshoot and fix the issue yourself. Remember to regularly inspect and maintain your battery to prevent future problems.

Leave a comment

Your email address will not be published. Required fields are marked *