I think I overtwisted my volume knob and managed to get two cables loose. I thought it was so simple that I would just solder them together, that did not work. Now I think that one of them is supposed to go to the jack, because there is only one cable to connected to the jack ATM. Both of the loose cables comes from the inside of the bass. http://imgur.com/a/XpVB2#0
There you got some pictures, I would be immensly happy if somone could tell me what to solder!