fatlady05

Hi,
a thief just stole my stereo and cut off the oem harness. I found a wiring diagramm and matched all the cable's with my radio plug. However I can not find the constant. The diagramm said its a white cable with blue stripes, but this cable doesn't work if I test it. I did check the fuse on the fuse panel below the steering wheel. Can somebody help me? Am I using the wrong cable or are there other fuses I have to consider.

Thanks for you help.