I have purchased a kenwood HU with RCA pre-outs for the fronts and rears as well as for sub. I connected the wiring harness to the factory wiring and it tested okay. I also purchased an alpine 4 channel amp for the front and rear (I do not have a sub as of yet.) Does it matter that i still have the factory speaker wires connected to the head unit? I couldn't get any output from it. It was late at night and I threw in the towel for the day after that... If anyone has any input I would greatly appreciate it!