Hi Maram, the relay if you have to find it is a question of following the cables from some lighthouse fool, the positive must follow, since the dough goes to the chassis surely. The false contact of the drum is a question of disassembling vote plastic and see how it is, take a picture and hang it here, the false contact maybe you solve it by welding the cable with the terminal that the drum has for the ignition. The ventilation of the air must check that 12V of food to the fan arrives at first. and check fuses to clear a little more.- Sa.ludos.