Hi. Would anyone what the problem might be here....

My car battery dies if not being used for around 10 hours. If I went out in it just now (8.30pm) for a few miles it will start in the morning. If I dont use it for the day, then the next morning the battery is flat.

I have bought a new battery, I've checked all bulbs around the car and only one is left on. This is the small bulb/light between the two clocks.I've been told that this is on all the time anyway.

Anyone know what might be causing the battery to drain?

Thanks for any help.