1996 Daihatsu Charade Battery running flat

Hi

Have a new battery installed in the car and it goes flat overnight. Put an amp meter on the battery and it is drawing 4.6 amps with the key in the off position.
Pulled all the fuses in the car and under the bonnet one by one to try and pinpoint the problem but it didnt solve anything. The only way I can get the amps to drop is by removing the two smaller leads that go to the positive side of the battery.
Any info on fixing this problem would be much appreciated.

Cheers