An unknown blower problem?

Hey guys, sorry that I have to start a new topic about it but the search did not give me any success.. to the problem: The blower motor from the escort of my buddy (75ps bj.96,without climate) wants more… I checked the fuse: Top Then I disassembled the front, removed the plug from the resistance and measured socket 1-3: Each time when switching through there are 12volts. So thought that the power supply is OK. Mass from motor to Karros.: Mass also ok. The resistance through: Also ok ay The blower motor to the battery: blower motor is running.. Was a little helpless…trotsdem ma on the resistance tapped and at the scrap metal a motor + blower was removed, because for both wanted only 15Euro… I put the thing in before (with great hope):nothing went… Again plug off measured: 12Volt on each level. The curious thing: If I plug the plug on the resistance and measure (if ventilation from 1-3 consecutively press) everywhere At the same time 12Volt is lying n, almost every fan phase on all 3 lines. But if I connect the plus cable of the blower motor, there is no longer any voltage to measure…I don’t understand…would it be possible that it is directly on the switch or that it is defective and somehow switches through mass as soon as the motor hangs on it? I exchanged the components and measured x-time… am grateful for every tip… Lg Bene