I had a aftermarket HU on before then it got stolen.

I just bought a Alpine CDA 105. When I went to plug the Black, Red, and Yellow cables up to the blue connector thing it didn't power the HU. What should I do?

guessing your 12v constant is prob dead on your car... this seems to be a common porblem on thirdgens.

what do you mean the blue conector. did you put the other headunit in or was it in there can you take a pic and post. There could be several reasons when i see what your talking about i could tell you how to fix.

Thanks. Friends found the problem, a blown 10 red fuse