Mazda 6 battery cable corrosion leading to wiring harness replacement and starting issues on Mazda 6

Some Mazda 6 owners report experiencing battery cable corrosion, particularly on the positive terminal, which can lead to significant issues. This corrosion often stems from an imperfect seal between the battery case and the lead post, allowing sulfuric acid to damage the battery posts. Severe corrosion can result in the terminal breaking, necessitating a replacement of the cable or even the wiring harness, which can cause starting issues and other electrical problems. Regular maintenance, including cleaning the corrosion from the cable and ensuring tight connections, is crucial to prevent these issues. Additionally, some owners note that overcharging the battery can accelerate the corrosion process, highlighting the importance of monitoring battery health. Promptly addressing battery cable corrosion through maintenance can help avoid more severe problems in the Mazda 6's electrical system.