I have just acquired a secondhand Kenwood Kdc-50-50r CD player. I removed an old Sony CD player from my Defender and when plugging the new Kenwood in I found that the socket which was originally connected to the Sony didn't fit the Kenwood, however there was another connector loose which did nothing before fitted it. I now have the original plug that fitted the Sony loose. There is no power to the new unit though. There is another socket in the Kenwood that is spare. Should I have another adaptor to connect the old plug into the spare socket on the kenwood? I hope you can understand this. Thanks for any help.