Newie here.....ok, I have a MKII that has never been modified in any way. The problem is when we boot it up under 110 there is no sound, also, when I hook the yellow 12v wire to positive and the black to negative, the entire system will not work. I checked for power all the way to the stereo and it is there. (fuse good) I checked the settings and it is not on aux power either. Any suggestions would be greatly appreciated. Thanx in advance, riogolf