Thank you Martin, but in this case the case is more complicated because the wires between the cell support and therefore inside the arm are made of thin copper covered with varnish like self wire, so there is no reference to know in which direction to connect them, only a wire, the ground wire of the arm is identifiable with an ohmmeter. On the cell side, we measure both coils, but we don’t know which one is red and which is white.
