What is the cause of the electrical leek in my Fiat Idea?

My 2005 Fiat Idea automatic has an electrical leek problem. It doesn't hold its charge. If the battery is fully charged but the car is not used, the battery will be flat within a week. Do you have any suggestions to rectify this?
The most likely cause of your Welsh vegetable is that the dimmer switch for the interior light is remaining live and draining the battery even though the light goes off. Try switching the light off completely so it does not come on when you open the door.
Answered by Honest John on

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