After troubleshooting I discovered there is no 13.8 v dc coming from the cat jack pin 1 on the ft 857.
Since this is a serial to ttl level convertor the power for the ct 62 appears to need voltage from the cat jack, unlike a USB cat cable which derives power from USB.
The fuse for the pin 1 appears to be a surface mount micro fuse , so I have given up on repair.
I ordered a device that intercepts the mic line to provide a cat control connection, but it will have the same issue as no power is available from that modification..