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Check Mercedes-Benz Battery & Alternator No Tools or Voltmeter

Step-by-step instructions on how to check the battery voltage and alternator condition via cluster on a Mercedes-Benz.

Check Mercedes-Benz Battery & Alternator No Tools or Voltmeter
ESTIMATED TIME 2 - 5 mins
DIY COST $0
DIFFICULTY Very Easy

The following procedure is a simple method to check if your Mercedes-Benz alternator is charging or check if the battery is discharged. 

Procedure

  1. Unlock the vehicle and go to the driver's seat.Going to the driver's door.

     

  2. Remove the push start button by pulling it out.Removing the push start button.

     

  3. Insert the key into the ignition and turn it one click.Turning the ignition switch one click.

     

  4. Use the steering wheel buttons to show the miles on the cluster.Miles Menu on the Cluster.

     

  5. Press the phone button and after 1 second, press the ok button and hold them both for five seconds.Pressing the phone button and the ok button.

     

  6. Select Vehicle Data on the cluster by pressing the ok button on the steering wheel.Selecting the Vehicle Data on the Cluster.

     

  7. The cluster will show the Battery's Voltage and Current.The voltage and current displacement show on the cluster.

     

  8. Start the vehicle and you will notice that the voltage will go up and the negative current turns to positive indicating that the current is going to the battery(charging). When the current is negative, the battery is supplying voltage to the vehicle and therefore discharging. The voltage and current displacement when the vehicle starts.

    This is a great idea to check what is happening with the alternator of your vehicle.

Battery Charge Level 

State of Charge Sealed or Flooded Lead Acid battery voltage AGM battery voltage
75% 12.40 12.60
50% 12.20 12.30
25% 12.00 12.00
0% 11.80 11.80

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Check Mercedes-Benz Battery & Alternator No Tools or Voltmeter Step-by-step instructions on how to check the battery voltage and alternator condition via cluster on a Mercedes-Benz.