I am unsure cause I dont know which wire is which,you can use the plug that is in it but a new one would be best unless you know the wiring better than I do,have only installed a few car stereos and just dont know much about them
I believe i found a manual for this if the model number is KDC-6015. Not sure what you mean by off-6015, but here is the link for the reciever: http://manual.kenwood.com/files/B64-1625-00.pdf