The harness I got from crutchfield doesn't have any blue or blue/white wires. Only a pink wire for the amp. I'm assuming right now i've got everything wired up correctly. The only reason I'm not sure is because I can't get the #(@#(*$ factory deck out. I've got the tools from crutchfield and am using ends for "Mercedes applications" but still no luck. The tools are certainly sharp though, my fingers are all cut up from the rough edges. I'm concerned about the different colors on the harnesses... we'll see how it goes.