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Question
battery discharging overnight

Answer
Hello,

You may have a parasitic draw. Purchase a cheap test light from a parts store. Disconnect the positive battery cable. Place the test light between the battery post and the cable. If the test light is on, you have a draw.
Finding it can be more challenging because opening the driver's door will also light the light. Remove the dome fuse. If the tight goes out, you know it is in that circuit. If not, it is some where else and you will need to remove and replace fuses until you find the source. Keep in mind, you need to look at the owners manual for multiple fuse boxes too.
If you find that the problem is in the dome circuit, there are many things on that circuit and you will need to start removing bulbs until the test light goes out. The cigarette lighters will need to be unplugged one by one. You ay want to search the internet to see what is on the dome circuit for your year make and model.
Good luck!

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