Thanks for the answer
Well, there is a point right there. Because the hot and the ground cables from the pickups are the same color!! the only difference is the gauge...
First, I used the thinest cables to the volume pot ground, but no sound came out. Then I inverted the cables and used the thickest ones, and then, started the sound, but with this problem...
Maybe the cables should be at the first position and the sound problem is another ... I should post a photo of them ...
Wich of the cables should be the hot? the thinest or the thickest?