Push the start button once. If you are using a key; turn it just one click.
Locate the Vehicle data on your cluster. Go to the trip menu on your cluster by using the left and right arrow buttons on your steering wheel. Then the next step is to push the phone button on the right side of your steering wheel and push the ok button on the left side of the steering wheel, holding them both for 5 seconds. Vehicle data will come up on the cluster.
Once the vehicle data comes up, push the ok button on your steering wheel, and you will see the battery voltage right away. If not, use the arrow keys to scroll down until you see the battery voltage on the cluster.
Start the engine. You will see that there's a voltage drop when you start your engine, but it will jump up within seconds. The voltage of your vehicle should be 13.8-14.7 volts, and if the voltage is low, your vehicle has an electrical issue such as a bad alternator or voltage regulator.
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Mercedes Benz GLK Class Check Battery Voltage Via Instrument Cluster This guide provides instructions on how to check the battery voltage of the Mercedes Benz GLK Class via Instrument Cluster.