Why does my BMW battery keep draining?

Why does my BMW battery keep draining?

Don’t overlook the possibility of the alternator or charging system not adequately recharging the battery as you drive. The cumulative loss over several driving cycles can leave the battery significantly discharged when you park the car. Normal parasitic loss can then deplete the battery in just a few days.

What causes BMW battery and alternator to warn?

Another common problem that causes BMW battery and alternator warning is a faulty BSD BMW module, typically mounted on the alternator. If the battery is relatively new, try charging the battery with a trickle charger. Additional problems that can cause this issue include.

What should the voltage be on a BMW battery?

With all electrical connections and battery cables in good shape, the voltage output should be anywhere from 13 to 14 volts. It is best if this value is between 13.8 and 14.2 volts. If the voltage is in the recommended range, the next step is to read the fault codes with a BMW All System Scanner. A BMW scanner will show a specific fault code.

Why does MY BMW battery not charge at full capacity?

Additional problems that can cause this issue include. Although the car will run with no noticeable issues when the alternator output is between 11 and 13 volts, it will not charge a battery to full capacity.

How can I tell if my BMW battery is bad?

However, the best way to verify the problem is to use a digital multimeter. Attach the two probes from the digital multimeter to the positive and negative battery terminals and turn the selector switch to DC voltage. Next, start the engine and let it idle.

Another common problem that causes BMW battery and alternator warning is a faulty BSD BMW module, typically mounted on the alternator. If the battery is relatively new, try charging the battery with a trickle charger. Additional problems that can cause this issue include.

With all electrical connections and battery cables in good shape, the voltage output should be anywhere from 13 to 14 volts. It is best if this value is between 13.8 and 14.2 volts. If the voltage is in the recommended range, the next step is to read the fault codes with a BMW All System Scanner. A BMW scanner will show a specific fault code.

When does BMW battery warning light come on?

When BMW alternator voltage output is above or below the recommended limit ( typically 13.3-14.5 volts), then the red battery warning light will illuminate on the dashboard, and a message will pop up on the iDrive screen.

Additional problems that can cause this issue include. Although the car will run with no noticeable issues when the alternator output is between 11 and 13 volts, it will not charge a battery to full capacity.