Mercedes-Benz S500 battery drains quickly, unable to locate electrical short on Mercedes-Benz S500

Some Mercedes-Benz S500 owners report experiencing quick battery drain issues, often linked to electrical system malfunctions such as short circuits, wiring problems, or faulty relays. These electrical issues can lead to excessive power consumption that depletes the battery rapidly. Additionally, owners may struggle to locate malfunctioning electronic parts that fail to enter "sleep" mode after the vehicle is turned off, making it essential to utilize diagnostic resources like the W220 S-Class Encyclopedia for assistance. Troubleshooting these electrical problems can be complex, and some owners find it necessary to seek professional help. Performing voltage drop tests with a multimeter can help isolate components responsible for the drain, while checking the Comfort Control Module may reveal current drain issues. To effectively test for electrical shorts, owners are advised to disconnect the negative battery cable, which can help prevent further complications.