![]() You may be required to enter the radio code after this test. Make sure you have the radio code written down.Make sure you have a fully charged battery.Lights, including light in the glove boxīefore you start troubleshooting battery drain problems.Top 7 Systems that Cause Battery Drain Problems The Mastech Digital Multimeter is what we use in this guide, it i s capable of reading currents, and you can buy it online, click here to check the price on Amazon. Multimeters are very inexpensive and are purchased for under $20. The multimeter should be able to read at least a 10 amp current. It would be best to have a multimeter to perform a current reading to troubleshoot the current draw. Even those systems that stay on always draw tiny currents, typically less than 50 milliamperes, and should not drain the battery.Ī defective electrical system, Control Unit, or a fault on the CAN Bus (Controller Area Network) also causes that can cause your Mercedes-Battery battery to die. While the electronic equipment in your car should not draw any current when the vehicle is parked, there are exceptions, such as the security system in your car. A straightforward example is when lights are left on overnight. You try to start your Mercedes-Benz, and the car is either completely dead, or this happens:īattery drains happen when electronic equipment (consumer units) constantly draws current from the battery while the car is parked. Does your Mercedes-Benz battery slowly drain? Is the battery dead every morning? Does the Mercedes-Benz battery die when you have the car parked overnight or leave it parked for a few days? This step-by-step guide will explain how to troubleshoot this problem, the basics of battery drain problems, why the battery dies overnight, most common trouble spots.
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