Mercedes-Benz C250 all dashboard lights on and electrical issues due to relay problem from water leakage on Mercedes-Benz C250

Some Mercedes-Benz C250 owners report experiencing dashboard lights turning on alongside various electrical issues, which may be linked to relay problems caused by water leakage. These owners note that the vehicle's electrical system, including the instrument cluster, is susceptible to flickering or failing dashboard lights. Additionally, water intrusion can lead to relay malfunctions, impacting critical components such as the alternator and Electronic Control Unit (ECU). Many report that checking the fuse box under the hood is vital, as it plays a key role in many electrical problems, necessitating dry and intact connections. Symptoms reported include battery warning lights, dimming lights, dead batteries, erratic behavior, and no-start conditions. Owners are advised to troubleshoot by checking fuses to identify simple issues or more serious electrical system problems. Furthermore, preventive measures against rodent damage are recommended, particularly in areas like wire harnesses and electronic systems, to mitigate potential electrical issues.