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What is draining my Renault clio battery?!

Done a battery test, plugged it in and battery is showing as fine. Charged the battery and then disconnected it and the next morning it was still dead
 
Ok so got the wires connected to a switch that disconnects the battery from the car over night.. Got up this morning turned the switch on and the car starts. So if it didn't start while the battery was disconnected from the car then we would know it was a battery fault .. But now that it did start we have no idea still what makes the battery drain!!
 
It's quite a heavy current drain, so try disconnecting the alternator itself over night.....every terminal!
John :)
 
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