Is this the wiring harness that was included with Kenwood or is this a universal fit wiring harness that links your Kenwood to your car? Universal wiring harnesses will supply all of the wiring possibilities for your head unit and vehicle. The extra wires could be as follows: Auxillarly lighting that may not be used in your particular installation, a CD changer controller/turn on lead, power antannae (some head units will operate a power antannae), or possibly something involving satellite radio. If your head unit has power and everything works fine I would consider the extra wires null and void for your installation.