Rest current measurement equals 17 A

Hello all, I just bridged the completely empty battery again and made 50 km of charging drive. After that I measured the rest current with the engine switched off and the key pulled out between the positive pole of the battery and the mass of the vehicle: 17 A, very fast falling to 15 A and less. With each new measurement again the same thing: 17 A falling. Yes what is that?! I pulled all fuses. Result: still 17A. Then it is no wonder that the battery always after 8 hours is empty Or did I do something wrong??? Tension is 11.7 V, after 5 minutes falling only 11,5… Greetings Markus