ok i will explain the short/long story i had an old head unit & the car was draining the battery so i bought a new head unit and plug the cables as they were, so the drain continues. so i did a lot of times the method you told me and the fuses that only make the difference was the electron battery fuse. Which it was radio and clock cluster so i suppose it was radio so i went to an electronic mechanic and he find out that in the radio harness the yellow cable(constant 12v) was the drain issue, so he swap it to the red cable which i think it is a ignition cable.