This might sound simple but im still unsure about it, I have a Mondeo MK4 and the battery is getting drained by the radio and instrument panel but until i can get it fixed i thought a temporary solution would be to just disconnect the battery terminals when im not using it overnight, that way the battery wont get drained because theres no power. Would i need to disconnect both the negative and positive or if i just disconnect the negative will it be safe to leave the pos connected and it shouldnt drain?.
The reason it is best to disconnect the negative (one of Car Talk’s puzzler questions) is that it is less likely you’ll short out the battery with the wrench and burn yourself or create a big spark. But if done carefully removing the positive cable is just as good of solution, at least for preventing battery drain. One caution, sometimes disconnecting battery will cause certain “remembered” settings to be forgotten. Radio station settings, door lock and window position settings, even the proper engine idle parameters.